1991 Pacific hurricane season
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2008-05-15T22:59:12Z
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{{Infobox hurricane season| name=1991 Pacific hurricane season
| first storm formed=[[May 16]], [[1991]]
| last storm dissipated=[[November 12]], [[1991]]
| strongest storm=''Kevin''-935 [[millibars|mb]]<ref name="kevinprelim1">{{cite web|author=Max Mayfield|year=1991|title=Hurricane Kevin Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/kevin/prenhc/prelim02.gif}}</ref>
| total storms=14
| major storms=5
| total damages=not available
| total fatalities=1 <ref name="eastnorthpac91">{{cite web|author=Max Mayfield and Edward Rappaport|year=1991|title=1991|publisher=Eastern North Pacific Hurricane Season of 1991|accessdate=2006-12-22|url=http://ams.allenpress.com/archive/1520-0493/120/11/pdf/i1520-0493-120-11-2697.pdf}}</ref>
| basin=Pacific hurricane
| five seasons=[[1989 Pacific hurricane season|1989]], [[1990 Pacific hurricane season|1990]], '''1991''', [[1992 Pacific hurricane season|1992]], [[1993 Pacific hurricane season|1993]]
}}
The '''1991 Pacific hurricane season''' officially started on [[May 15]], [[1991]] in the eastern Pacific, and on [[June 1]], [[1991]] in the central Pacific, and lasted until [[November 30]], [[1991]]. These dates conventionally delimit the period of each year when most tropical cyclones form in the northeastern [[Pacific Ocean]].
There are few notable systems this year. Tropical Depression Five-E killed one person in [[Mexico]]. Elsewhere, Hurricane Fefa caused flooding in [[Hawaii]]. Hurricane Kevin resulted the longest lasting hurricane in the northern Eastern Pacific Basin and Hurricane Nora became the strongest November storm at that time, as [[2006 Pacific hurricane season#Hurricane Sergio|Hurricane Sergio during the 2006 season]] broke the record recently.<ref name="eastnorthpac91">{{cite web|author=Max Mayfield and Edward Rappaport|year=1991|title=1991|publisher=Eastern North Pacific Hurricane Season of 1991|accessdate=2006-12-22|url=http://ams.allenpress.com/archive/1520-0493/120/11/pdf/i1520-0493-120-11-2697.pdf}}</ref>
<ref name="sergio06">{{cite web|author=Richard Pasch and David Roberts|year=2006|title=Tropical Cyclone Report on Hurricane Sergio|publisher=National Hurricane Center|accessdate=2006-12-23|url=http://www.nhc.noaa.gov/pdf/TCR-EP212006_Sergio.pdf}}</ref>
==Season summary==
{{Saffir-Simpson small}}
The 1991 season in the eastern North Pacific Ocean had a total of sixteen tropical cyclones developed, featuring ten hurricanes, 4 tropical storms and 2 tropical depressions. These totals are close to the [[climate|climatological]] averages established since 1966, when satellite surveillance began.
Nevertheless, 1991 had some important peculiarities. First of all, this season had the second earliest start, only behind [[1990 Pacific hurricane season|last year]]. The season also ended late with the first November hurricane since the last quarter of [[century]]. On the other hand, the months of July and August, often the most active ones in this basin, only produced two tropical cyclones each one.
None of the tropical storms or hurricanes made landfall. One of the two tropical depressions of the season, Five-E, came ashore near [[Salina Cruz]], [[Mexico]], on the last day of June. The depression caused the only fatality of the season and 500 injuries with 2 people reportedly missing. Delores, Ignacio and Marty threatened the coast of [[Mexico]]. Also, Tropical Storm Ignacio was also responsible for 40 injuries as the system passed just offshore of [[Lázaro Cárdenas, Michoacán|Lázaro Cárdenas]], [[Mexico]].
Several tropical cyclones grew into specially long-lived and intense overwater systems. In fact, Hurricane Kevin endured as a hurricane for 12½ days to the east of 140°W, establishing a new record for longevity in the eastern Pacific. It is also important to remark that most of the cyclones this season originated from African tropical waves.<ref name="eastnorthpac91">{{cite web|author=Max Mayfield and Edward Rappaport|year=1991|title=1991|publisher=Eastern North Pacific Hurricane Season of 1991|accessdate=2006-12-22|url=http://ams.allenpress.com/archive/1520-0493/120/11/pdf/i1520-0493-120-11-2697.pdf}}</ref>
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==Activity==
With fourteen cyclones, this season was slightly below average. There were ten hurricanes, five hurricanes of Category 3 intensity or higher on the [[Saffir-Simpson Hurricane Scale]], and four tropical storms. No storms formed in the Central Pacific.<ref name="eastnorthpac91">{{cite web|author=Max Mayfield and Edward Rappaport|year=1991|title=1991|publisher=Eastern North Pacific Hurricane Season of 1991|accessdate=2006-12-22|url=http://ams.allenpress.com/archive/1520-0493/120/11/pdf/i1520-0493-120-11-2697.pdf}}</ref>
===Tropical Storm Andres===
{{infobox hurricane small
| name=Tropical Storm Andres
| category=storm
| type=tropical storm
| track=Andres 1991 track.png
| image=Ts andres 1991.JPG
| formed=[[May 16]]
| dissipated=[[May 20]]
| highest winds=60 [[miles per hour|mph]] (100 [[kilometres per hour|km/h]])
| lowest pressure=994 [[Bar (unit)|mbar]]<ref name="andresprelim1">{{cite web|author=Max Mayfield|year=1991|title=Tropical Strom Andres Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/andres/prenhc/prelim01.gif}}</ref>}}
The first [[tropical depression]] of 1991 in the eastern [[Pacific Ocean|Pacific]] formed about 1000 [[nautical miles]] (1850 km) southwest of the southern tip of [[Baja California peninsula|Baja California]] on [[May 16]]. This was the second earliest date for a tropical depression to form in this basin since weather satellite monitoring started in 1966. The earliest was [[1990 Pacific hurricane season|the year before]], when the depression which later became Hurricane Alma formed on [[May 12]].<ref name="andresprelim1">{{cite web|author=Max Mayfield|year=1991|title=Tropical Strom Andres Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/andres/prenhc/prelim01.gif}}</ref>
A tropical disturbance organized into Tropical Depression One-E on [[May 16]]. The depression moved into a slow cyclonic loop and became Tropical Storm Andres [[May 17|the next day]]. Andres then developed rapidly, with a minimum pressure of 994 [[millibar|mbar]] and corresponding maximum winds of 60 [[mph]] (95 [[kilometer per hour|km/h]]). This intensity was maintained for a day and subsequently weakened as upper level [[Wind shear|shear]] increased. Andres was downgraded to a tropical depression on [[May 19]] and finally dissipated on [[May 20]].<ref name="andresprelim1">{{cite web|author=Max Mayfield|year=1991|title=Tropical Strom Andres Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/andres/prenhc/prelim01.gif}}</ref>
There were no reported damages or casualties caused by Andres.<ref name="andresprelim2">{{cite web|author=Max Mayfield|year=1991|title=Tropical Strom Andres Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/andres/prenhc/prelim02.gif}}</ref>
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===Tropical Storm Blanca===
{{infobox hurricane small
| name=Tropical Storm Blanca
| category=storm
| type=tropical storm
| track=Blanca 1991 track.png
| image=Tropical storm blanca 1991.JPG
| formed=[[June 14]]
| dissipated=[[June 22]]
| highest winds=60 [[miles per hour|mph]] (100 [[kilometres per hour|km/h]])
| lowest pressure=994 [[Bar (unit)|mbar]]<ref name="blancaprelim1">{{cite web|author=Hal Gerrish|year=1991|title=Tropical Strom Blanca Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/blanca/prenhc/prelim01.gif}}</ref><ref name="blancaprelim3">{{cite web|author=Hal Gerrish|year=1991|title=Tropical Strom Blanca Prelim 3|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/blanca/prenhc/prelim03.gif}}</ref>}}
A well organized tropical wave over northern [[Africa]] moved off on [[May 31]]. The wave never showed signs of organization while crossing the [[Atlantic]] and emerged into the eastern North Pacific on [[June 10]]. It was not until [[June 13]] when the convection associated with the wave became better organized and [[June 14|the next day]], Tropical Depression Two-E was formed, about 450 nautical miles (830 km) from [[Acapulco]], [[Mexico]].<ref name="blancaprelim1">{{cite web|author=Hal Gerrish|year=1991|title=Tropical Strom Blanca Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/blanca/prenhc/prelim01.gif}}</ref>
For the next 48 hours, the depression moved toward the west and then northwest in response to a weakening ridge to the northwest. On [[June 17]], the strong shear relaxed somewhat and the exposed center moved under the deep convection again. Thus, the depression strengthened into a tropical storm about 630 nautical miles (1165 km) south of the southern tip of Baja California. Tropical Storm Blanca experienced limited development, reaching its peak intensity of 60 [[mph]] (95 km/h) early on [[June 20]]. Then, the center of Blanca became exposed again and weakened into a tropical depression on [[June 21]]. Finally, it dissipated on [[June 22]] over colder waters about 1285 nautical miles (2380 km) southwest of the southern tip of Baja California.<ref name="blancaprelim1">{{cite web|author=Hal Gerrish|year=1991|title=Tropical Strom Blanca Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/blanca/prenhc/prelim01.gif}}</ref>
There were no casualties or damages attributed to Blanca.<ref name="blancaprelim2">{{cite web|author=Hal Gerrish|year=1991|title=Tropical Strom Blanca Prelim 2|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/blanca/prenhc/prelim02.gif}}</ref>
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===Hurricane Carlos===
{{infobox hurricane small
| name=Hurricane Carlos
| category=cat3
| type=hurricane
| track=Carlos 1991 track.png
| image=Hurricane carlos 1991.JPG
| formed=[[June 16]]
| dissipated=[[June 27]]
| highest winds=120 [[miles per hour|mph]] (195 [[kilometres per hour|km/h]])
| lowest pressure=955 [[Bar (unit)|mbar]]<ref name="carlosprelim3">{{cite web|author=Lixion Avila|year=1991|title=Tropical Strom Carlos Prelim 3|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/carlos/prenhc/prelim03.gif}}</ref>}}
A tropical wave left the African coast on [[June 4]] showing some cyclonic curvature in the low clouds. It passed [[Barbados]] six days later, where a low-to-mid wind shift was detected. The wave was followed by a low level wind surge which was observed in [[Curaçao]] on [[June 12]]. Most of the shower activity associated with the wave moved westward over [[South America]], and then over [[Panama]] on [[June 14]]. The convection became organized and developed into Tropical Depression Three-E, 300 nautical miles (560 km) south of [[Salina Cruz]], on [[June 16]]. It became a tropical storm one day later. Carlos reached minimal hurricane strength on [[June 18]] but two days later, Carlos was briefly downgraded to [[tropical storm]] status. A strong [[high pressure system]] forced Carlos to move over warmer waters and Carlos began to reintensify. Carlos regained hurricane status and developed a well-defined eye and excellent upper level outflow. On [[June 24]], Carlos peaked at 955 mb and 115 [[mph]] (185 km/h) maximum sustained winds. The hurricane then weakened when it moved west over colder waters and encountered upper level shear. Carlos dissipated on [[June 27]].
There were no reported damages or casualties caused by Carlos. <ref name="carlosprelim1">{{cite web|author=Lixion Avila|year=1991|title=Tropical Strom Carlos Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/carlos/prenhc/prelim01.gif}}</ref>
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===Hurricane Delores===
{{infobox hurricane small
| name=Hurricane Delores
| category=cat1
| type=hurricane
| track=Delores 1991 track.png
| image=Hurricane delores 1991.JPG
| formed=[[June 24]]
| dissipated=[[June 29]]
| highest winds=85 [[miles per hour|mph]] (135 [[kilometres per hour|km/h]])
| lowest pressure=979 [[Bar (unit)|mbar]]<ref name="deloresprelim3">{{cite web|author=Miles Lawrence|year=1991|title=Hurricane Delores Prelim 3|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/andres/prenhc/prelim03.gif}}</ref>}}
Delores developed from a tropical wave which moved from [[Africa]] to the Atlantic on [[June 7]]. And it was not until [[June 22]] when it gained organization and was identified as an area of disturbed weather south of [[Mexico]].<ref name="deloresprelim1">{{cite web|author=Miles Lawrence|year=1991|title=Hurricane Delores Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/delores/prenhc/prelim01.gif}}</ref>
The system immediately showed signs of rotation and it was upgraded to Tropical Depression Four-E the same day. It was centered about {{convert|450|nmi|km|-1}} south-southeast of [[Manzanillo, Colima|Manzanillo]], [[Mexico]]. Then, the depression reached storm strength, enough to be called Delores on [[June 24]] while 150 nautical miles (230 km) from the coast of [[Mexico]]. It rapidly intensified to a hurricane the [[June 25|next day]] as it approached to the coast. However it repidly weakened and on [[June 27]] it was downgraded to tropical storm status as it was moving over colder waters. Its deep convection gradually diminished and its west-northwestward motion abruptly halted as the system was being sheared. It weakened to a depression on [[June 28]] near [[Socorro Island]] and it dissipated on [[June 29]].<ref name="deloresprelim1">{{cite web|author=Miles Lawrence|year=1991|title=Hurricane Delores Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/delores/prenhc/prelim01.gif}}</ref>
No damages or casualties caused by Delores were reported.<ref name="deloresprelim2">{{cite web|author=Miles Lawrence|year=1991|title=Hurricane Delores Prelim 2|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/delores/prenhc/prelim02.gif}}</ref>
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===Tropical Depression Five-E===
{{infobox hurricane small
| name=Tropical Depression Five-E
| category=depression
| type=tropical depression
| image=Td-5 1991.JPG
| formed=[[June 29]]
| dissipated=[[June 30]]
| highest winds=35 [[miles per hour|mph]] (55 [[kilometres per hour|km/h]])
| lowest pressure=N/A [[Bar (unit)|mbar]]<ref name="tcd05e1">{{cite web|author=Mayfield|year=1991|title=Tropical Discussion One on 5-E|publisher=National Hurricane Center|accessdate=2006-12-23|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/td5e/tropdisc/nep0591.001}}</ref><ref name="tcd05e3">{{cite web|author=Avila|year=1991|title=Tropical Discussion Three on 5-E|publisher=National Hurricane Center|accessdate=2006-12-23|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/td5e/tropdisc/nep0591.003}}</ref>}}
A tropical disturbance south of the [[Gulf of Tehuantepec]] became better organized on [[June 29]] and became a tropical depression. Strengthening was very limited as the depression was approaching to land. It made landfall later that day very near of [[Salina Cruz]], [[Oaxaca]]. It dissipated the [[June 30|next day]], bringing torrential showers to [[Oaxaca]].<ref name="tcd05e1">{{cite web|author=Mayfield|year=1991|title=Tropical Discussion One on 5-E|publisher=National Hurricane Center|accessdate=2006-12-23|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/td5e/tropdisc/nep0591.001}}</ref><ref name="tcd05e2">{{cite web|author=Avila|year=1991|title=Tropical Discussion Two on 5-E|publisher=National Hurricane Center|accessdate=2006-12-23|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/td5e/tropdisc/nep0591.002}}</ref><ref name="tcd05e3">{{cite web|author=Avila|year=1991|title=Tropical Discussion Three on 5-E|publisher=National Hurricane Center|accessdate=2006-12-23|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/td5e/tropdisc/nep0591.003}}</ref>
The depression caused the year's lone fatality and occasionated the most significant damage as it destroyed up to 118 homes, caused 500 injuries and two people reportedly missing. Rainfall totals as large as 235 mm (0.80 ft) in 24 hours accompanied the depression over [[Mexico]]. <ref name="eastnorthpac91">{{cite web|author=Max Mayfield and Edward Rappaport|year=1991|title=1991|publisher=Eastern North Pacific Hurricane Season of 1991|accessdate=2006-12-22|url=http://ams.allenpress.com/archive/1520-0493/120/11/pdf/i1520-0493-120-11-2697.pdf}}</ref>
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===Hurricane Enrique===
{{infobox hurricane small
| name=Hurricane Enrique
| category=cat1
| type=hurricane
| track=Enrique 1991 track.png
| image=Hurricane enrique 1991.JPG
| formed=[[July 15]]
| dissipated=[[July 20]]
| highest winds=75 [[miles per hour|mph]] (120 [[kilometres per hour|km/h]])
| lowest pressure=987 [[Bar (unit)|mbar]]<ref name="enriqueprelim3">{{cite web|author=Ed Rappaport|year=1991|title=Hurricane Enrique Prelim 3|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/andres/prenhc/prelim03.gif}}</ref>}}
Enrique formed from a westward-moving tropical wave that crossed the [[Atlantic ocean|Atlantic]] between [[June 30]] and [[July 8]]. A short-lived cyclonic circulation center within the wave was detected on satellite imagery when the system was over the eastern Atlantic. However, persistent deep convection did not occur until the wave neared the [[Gulf of Tehuantepec]] in the eastern [[Pacific Ocean]] on [[July 11]].<ref name="enriqueprelim1">{{cite web|author=Ed Rappaport|year=1991|title=Hurricane Enrique Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/enrique/prenhc/prelim01.gif}}</ref>
On [[July 12]], the convection became more concentrated about {{convert|500|nmi|km|-1}} south of [[Acapulco]], near a mid-level vortex within the wave, however it had diminished the [[July 13|next day]]. The organization of the system began on [[July 14]], becoming Tropical Depression Six-E the next day. The depression intensified further and became Tropical Storm Enrique. Then, on [[July 17]], it reached hurricane intensity for a brief period of time and an eye was identified. But due to shear associated with a trough, Enrique began to feel the effects and hence started to weaken. Also Enrique entered over cooler waters and its center became exposed. Enrique was downgraded to a depression on [[July 19]] and it eventually dissipated the 20th.<ref name="enriqueprelim1">{{cite web|author=Ed Rappaport|year=1991|title=Hurricane Enrique Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/enrique/prenhc/prelim01.gif}}</ref><ref name="enriqueprelim2">{{cite web|author=Ed Rappaport|year=1991|title=Hurricane Enrique Prelim 2|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/enrique/prenhc/prelim02.gif}}</ref>
No damages or casualties were caused by Enrique.<ref name="enriqueprelim2">{{cite web|author=Ed Rappaport|year=1991|title=Hurricane Enrique Prelim 2|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/enrique/prenhc/prelim02.gif}}</ref>
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===Hurricane Fefa===
{{hurricane main|Hurricane Fefa}}
{{infobox hurricane small
| name=Hurricane Fefa
| category=cat3
| type=hurricane
| track=Fefa 1991 track.png
| image=Hurricane Fefa.JPG
| formed=[[July 29]]
| dissipated=[[August 8]]
| highest winds=120 [[miles per hour|mph]] (195 [[kilometres per hour|km/h]])
| lowest pressure=959 [[Bar (unit)|mbar]]<ref name="fefaprelim4">{{cite web|author=Max Mayfield|year=1991|title=Hurricane Fefa Prelim 4|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/fefa/prenhc/prelim04.gif}}</ref>}}
A wave became better organized and it developed into [[Tropical Depression]] Seven-E while 850 nautical miles (1570 km) south-southeast of [[Cabo San Lucas]] on [[July 29]]. The depression intensified quickly and became Tropical Storm Fefa the same day. Fefa continued to strengthen over the warm Pacific water and reached hurricane status on [[July 31]]. Satellite imagery showed the appearance of an eye [[August 1|the next day]]. Fefa peaked on [[August 2]] with a pressure of 959 [[millibar|mbar]] and 120 [[mph]] (195 km/h) maximum sustained winds, making it a Category 3 hurricane in the [[Saffir-Simpson Hurricane Scale]]. Later, on [[August 5]], Fefa crossed into the north Central Pacific basin.<ref name="fefaprelim1">{{cite web|author=Max Mayfield|year=1991|title=Hurricane Fefa Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/fefa/prenhc/prelim01.gif}}</ref><ref name="fefaprelim2">{{cite web|author=Max Mayfield|year=1991|title=Hurricane Fefa Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/fefa/prenhc/prelim02.gif}}</ref>
As it crossed, shear had increased and Fefa began to weaken as it approached rapidly to the [[Hawaiian Islands]] as a tropical storm on [[August 7]]. Fefa passed over the [[Hawaii (island)|Big Island]] and rapidly weakened back to a tropical depression later that day to finally dissipate on [[August 9]] northwest [[Kauai]]. <ref name="fefacp">{{cite web|author=Central Pacific Hurricane Center|year=1991|title=Hurricane Fefa Report on Central Pacific|publisher=CPHP|accessdate=2006-12-22|url=http://www.prh.noaa.gov/cphc/summaries/1991.php}}</ref>
The remnants of Fefa caused heavy rains and strong winds in the counties of [[Hawaii]] and [[Kauai]]. Flash flooding was reported in the [[Kohala, Hawaii|Kohala]] and [[Hamakua]] districts. [[Lightning]] injuried two persons on the Big Island.<ref name="fefacp">{{cite web|author=Central Pacific Hurricane Center|year=1991|title=Hurricane Fefa Report on Central Pacific|publisher=CPHP|accessdate=2006-12-22|url=http://www.prh.noaa.gov/cphc/summaries/1991.php}}</ref>
===Hurricane Guillermo===
{{infobox hurricane small
| name=Hurricane Guillermo
| category=cat1
| type=hurricane
| track=Guillermo 1991 track.png
| image=Hurricane Guillermo 1991.JPG
| formed=[[August 4]]
| dissipated=[[August 10]]
| highest winds=75 [[miles per hour|mph]] (120 [[kilometres per hour|km/h]])
| lowest pressure=993 [[Bar (unit)|mbar]]<ref name="guillermprelim1">{{cite web|author=Max Mayfield|year=1991|title=Hurricane Guillermo Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/guillerm/prenhc/prelim01.gif}}</ref>}}
The tropical wave that ultimately produced Guillermo emerged from the northwest coast of [[Africa]] on [[July 22]]. The wave had a large amplitude, but very little deep [[convection]] while moving westward across the tropical Atlantic. The convection associated with the southern portion of the wave passed over the [[Windward Islands]] on [[July 28]] and crossed [[Central America]] on [[July 31]].<ref name="guillermprelim1">{{cite web|author=Max Mayfield|year=1991|title=Hurricane Guillermo Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/guillerm/prenhc/prelim01.gif}}</ref>
Signs of organization were evident late on [[August 2]] when the wave was south of the [[Gulf of Tehuantepec]]. Then, on [[August 4]], Tropical Depression Eight-E was formed while centered 300 nautical miles (560 km) south-southeast of [[Acapulco]], [[Mexico]]. Although the presence of easterly [[Wind shear|shear]], the depression gradually intensified as the center moved toward the west-northwest, paralleling the coast of [[Mexico]]. Then, it reached tropical storm strength the same day as it was centered south-southwest of Acapulco, Mexico. It peaked on [[August 5]] with a central pressure of 993 mb and maximum sustained winds of 75 mph (120 km/h), while {{convert|220|nmi|km|-1}} of [[Manzanillo, Colima|Manzanillo]], Mexico.
After its peak, Guillermo weakened to tropical storm status as it was losing convection. It subsequently weakened back to a tropical depression and then it dissipated on [[August 10]].<ref name="guillermprelim1">{{cite web|author=Max Mayfield|year=1991|title=Hurricane Guillermo Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/guillerm/prenhc/prelim01.gif}}</ref>
There were no damages or casualties associated with Guillermo.<ref name="guillermprelim2">{{cite web|author=Max Mayfield|year=1991|title=Hurricane Guillermo Prelim 2|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/guillerm/prenhc/prelim02.gif}}</ref>
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===Tropical Storm Hilda===
{{infobox hurricane small
| name=Tropical Storm Hilda
| category=storm
| type=tropical storm
| track=Hilda 1991 track.png
| image=Tropical Storm Hilda 1991.JPG
| formed=[[August 8]]
| dissipated=[[August 14]]
| highest winds=60 [[miles per hour|mph]] (100 [[kilometres per hour|km/h]])
| lowest pressure=993 [[Bar (unit)|mbar]]<ref name="hildaprelim1">{{cite web|author=Lixion Avila|year=1991|title=Tropical Strom Hilda Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/hilda/prenhc/prelim01.gif}}</ref>}}
Satellite imagery showed a convective area with some cyclonic turning in connection with a tropical wave over [[Africa]] on [[July 22]]. The convection gradually diminished as the system moved west-southwest into the Atlantic. On [[July 31]], the wave passed south of [[Trinidad]], where a low-level wind shift was detected. For the next couple of days, this system passed over [[Venezuela]] and [[Colombia]]. Then it crossed into the [[Pacific]] basin. It was not until [[August 6]], while it was south of [[Guatemala]], when the convection became organized. Then, the wave strengthened into a tropical depression about 200 [[nautical miles]] (370 km/h) south-southwest of [[Acapulco]], on [[August 8]]. The system intensified further and became Tropical Storm Hilda [[August 9|the next day]]. The storm reached its peak intensity on [[August 11]] with estimated {{convert|60|mi/h|km/h|-1|abbr=on}} maximum winds and a pressure of 993 mb. The tropical storm moved on a general west-northwest track for the next couple of days and then turned toward the north on [[August 13]] as it was under the influence of an upper level [[Trough (meteorology)|trough]]. Later on that day, tropical storm force winds were reported on [[Guadalupe Island]] as the center of Hilda was located about 150 nautical miles (280 km) from the island. Hilda gradually weakened over cool waters but maintained a rather large level of circulation which produced some rain over [[California]]. The depression dissipated on [[August 14]]. The process of dissipation was slower than usual, probably due to the large size of Hilda's circulation. There were no casualties or damages reported from Hilda. <ref name="hildaprelim1">{{cite web|author=Lixion Avila|year=1991|title=Tropical Strom Hilda Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/hilda/prenhc/prelim01.gif}}</ref>
<div style="clear: both"></div>
===Tropical Depression Ten-E===
{{infobox hurricane small
| name=Tropical Depression Ten-E
| category=depression
| type=tropical depression
| image=Td 10-e 1991.JPG
| formed=[[September 12]]
| dissipated=[[September 13]]
| highest winds=35 [[miles per hour|mph]] (55 [[kilometres per hour|km/h]])
| lowest pressure=N/A [[Bar (unit)|mbar]]<ref name="td05e1">{{cite web|author=Rappaport|year=1991|title=Tropical Depression Ten-E Discussion One|publisher=National Hurricane Center|accessdate=2006-12-23|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/td10e/tropdisc/nep1091.001}}</ref>}}
A tropical disturbence southwest of [[Manzanillo, Colima|Manzanillo]] became a tropical depression on [[September 12]] as its [[convection]] became persistent around the new formed circulation center. But the development of the conditions were not favorable because the depression was embedded in a strong shear environment caused by a trough. Then the depression took a northwesternward and then a northward track to finally dissipate on [[September 13]] as it was being sheared in the southern [[Gulf of California]].<ref name="td05discussions">{{cite web|author=National Hurricane Center|year=1991|title=Tropical Depression Ten-E Discussions|publisher=National Hurricane Center|accessdate=2006-12-23|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/td10e/tropdisc/}}</ref>
Tropical Depression Ten-E brought heavy showers to the states of [[Jalisco]] and [[Colima]], but there were no reported deaths or damages. <ref name="td05discussions">{{cite web|author=National Hurricane Center|year=1991|title=Tropical Depression Ten-E Discussions|publisher=National Hurricane Center|accessdate=2006-12-23|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/td10e/tropdisc/}}</ref>
<div style="clear: both"></div>
===Tropical Storm Ignacio===
{{infobox hurricane small
| name=Tropical Storm Ignacio
| category=storm
| type=tropical storm
| track=Ignacio 1991 track.png
| image=Ignacio 1991.JPG
| formed=[[September 16]]
| dissipated=[[September 19]]
| highest winds=60 [[miles per hour|mph]] (100 [[kilometres per hour|km/h]])
| lowest pressure=994 [[Bar (unit)|mbar]]<ref name="ignacioprelim4">{{cite web|author=Max Mayfield|year=1991|title=Tropical Strom Ignacio Prelim 4|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/ignacio/prenhc/prelim04.gif}}</ref>}}
Two waves had moved westward across the [[Atlantic]] during the first ten days of September. [[1991 Atlantic hurricane season#Tropical Storm Erika|Tropical Storm Erika]] formed over the east-central Atlantic from the trailing wave. Otherwise, the waves were accompanied by only a small amount of cloudiness before entering the eastern Pacific between [[September 10]] and [[September 12]].<ref name="ignacioprelim1">{{cite web|author=Ed Rappaport|year=1991|title=Tropical Strom Ignacio Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/ignacio/prenhc/prelim01.gif}}</ref>
The area of convection developed southeast of an upper level low centered about {{convert|250|nmi|km|-1}} west of the southern tip of [[Baja California peninsula]]. A trough axis extended southward from the low to the west of the convection. By [[September 15]], the area of disturbed weather included some convective bands. The organization of the convection improved and the cloud system became Tropical Depression Eleven-E [[September 16|the next day]]. The trough that was near the depression moved the cyclone to the north-northwest and during that period it strengthened and became Tropical Storm Ignacio, all on the same day. Then, the influence of the trough over Tropical Ignacio diminished. The track of the tropical storm was a small clockwise loop, which Ignacio reached the northernmost point on [[September 17]]. The storm was centered about 25 nautical miles (45 km) offshore and was near its peak intensity, {{convert|60|mi/h|km/h|-1|abbr=on}}. Further intensification was precluded by the storm's proximity to land and by shear associated with the low near the Baja California peninsula. As Ignacio turned toward the east, its forward motion slowed. When the storm began moving to the south, it lost its identity very rapidly. Ignacio weakened to depression status and dissipated six hours later. The remnants of Ignacio moved toward the west-southwest over the next two days.<ref name="ignacioprelim1">{{cite web|author=Ed Rappaport|year=1991|title=Tropical Strom Ignacio Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/ignacio/prenhc/prelim01.gif}}</ref>
Ignacio caused street flooding in Acapulco. However, no further damages or casualties were reported from this storm.<ref name="ignacioprelim2">{{cite web|author=Ed Rappaport|year=1991|title=Tropical Strom Ignacio Prelim 2|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/ignacio/prenhc/prelim02.gif}}</ref>
<div style="clear: both"></div>
===Hurricane Jimena===
{{infobox hurricane small
| name=Hurricane Jimena
| category=cat4
| type=hurricane
| track=Jimena 1991 track.png
| image=Hurricane jimena 1991.JPG
| formed=[[September 20]]
| dissipated=[[October 2]]
| highest winds=140 [[miles per hour|mph]] (225 [[kilometres per hour|km/h]])
| lowest pressure=945 [[Bar (unit)|mbar]]<ref name="jimenaprelim2">{{cite web|author=Richard Pasch|year=1991|title=Hurricane Jimena Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/jimena/prenhc/prelim02.gif}}</ref>}}
The tropical wave from which Jimena originated moved off the coast of [[Africa]] on [[September 5]] as a fairly active-looking system. Part of this wave strengthened into [[1991 Pacific hurricane season#Tropical Storm Danny|Tropical Storm Danny]] over the eastern [[Atlantic]]. The southern portion of the system proceeded westward uneventfully over the [[Caribbean]]. As it passed over [[Panama]] and [[Costa Rica]] during [[September 14]] and [[September 15]], the convective activity increased. The system moved westward as an area of disturbed weather in the [[Pacific ocean|Pacific]] [[ITCZ]] over the next few days. The convection became sufficiently well organized and intensification took some time due to an upper level anticyclone north on [[Mexico]]. But on [[September 20]] the cloud pattern had increased and was upgraded to a tropical depression. <ref name="jimenaprelim1">{{cite web|author=Richard Pasch|year=1991|title=Hurricane Jimena Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/jimena/prenhc/prelim01.gif}}</ref>
It took about one day the depression to strengthen into a tropical storm, as it improved its banding features. The cyclone was tracking in a northwestward direction. After becoming tropical storm, the ensuing development was rather rapid, particularly after [[September 22]] as a banding type eye was forming. Further rapid development took place over the next 24 hours and the maximum sustained winds increased to near {{convert|130|mi/h|km/h|-1|abbr=on}} by the afternoon of [[September 23]]. Later, on [[September 24]] Jimena reached her peak with maximum winds of {{convert|140|mi/h|km/h|-1|abbr=on}} and a minimum central pressure of 945 mb. Jimena maintained herself as a powerful hurricane for three days, moving practically due west until [[September 26]], when it turned toward the west-northwest. Jimena began to weaken on [[September 27]]. A northwestward movement commenced on [[September 29]] in response to a large trough which developed in its northwest. It continued to weaken and on [[September 30]] it weakened back to a tropical storm and then downgraded to a depression. On [[October 2]] was declared dissipated.<ref name="jimenaprelim1">{{cite web|author=Richard Pasch|year=1991|title=Hurricane Jimena Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/jimena/prenhc/prelim01.gif}}</ref><ref name="jimenaprelim2">{{cite web|author=Richard Pasch|year=1991|title=Hurricane Jimena Prelim 2|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/jimena/prenhc/prelim02.gif}}</ref>
There were no casualties or damages reported from Jimena.<ref name="jimenaprelim2">{{cite web|author=Richard Pasch|year=1991|title=Hurricane Jimena Prelim 2|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/jimena/prenhc/prelim02.gif}}</ref>
<div style="clear: both"></div>
===Hurricane Kevin===
{{infobox hurricane small
| name=Hurricane Kevin
| category=cat4
| type=hurricane
| track=Kevin 1991 track.png
| image=Kevin 1991.JPG
| formed=[[September 25]]
| dissipated=[[October 11]]
| highest winds=145 [[miles per hour|mph]] (230 [[kilometres per hour|km/h]])
| lowest pressure=935 [[Bar (unit)|mbar]]<ref name="kevinlim1">{{cite web|author=Max Mayfield|year=1991|title=Hurricane Kevin Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/kevin/prenhc/prelim01.gif}}</ref>}}
Kevin formed from a westward-moving tropical wave which emerged from the northwest coast of [[Africa]] on [[September 11]]. The wave crossed into the [[Pacific]] basin on [[September 21]] with no signs of development. Cloudiness and convection became better organized on the first hours of [[September 24]], becoming Tropical Depression Thirteen-E [[September 25|the next day]] as it was located about {{convert|350|nmi|km|-1}} southeast of [[Acapulco]], [[Mexico]]. Then the depression moved toward the west. <ref name="kevinprelim1">{{cite web|author=Max Mayfield|year=1991|title=Hurricane Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/kevin/prenhc/prelim01.gif}}</ref>
The banding pattern became more pronounced and the depression was upgraded to Tropical Storm Kevin later that day, being centered about 275 n mi south-southeast of [[Acapulco]]. The convective banding increased for the next 24 hours and Kevin strengthened to hurricane status on [[September 26]], while {{convert|200|nmi|km|-1}} south-southwest of [[Acapulco]]. Kevin continued to strengthen and showed intermitten glimpses of an eye the days 27 and [[28 September]]. By [[September 29]], Kevin had a well-defined eye and this feature persisted for several days. The hurricane continued to strengthen and on [[October 1]] reached its peak intensity while centered {{convert|350|nmi|km|-1}} south-southwest of the southern tip of [[Baja California]], with estimated {{convert|145|mi/h|km/h|0|abbr=on}} maximum winds and a minimum pressure of {{convert|935|mi/h|km/h|0|abbr=on}}. Kevin was moving toward the west at this time, but turned toward the west-southwest in response of a strong [[high pressure system]] located northwest of the hurricane. Then, Kevin began to weaken gradually and its eye became poorly defined on [[October 4]]. It weakened to a minor hurricane on [[October 6]] as the hurricane began turning toward the northwest and continued this general motion for the next few days. <ref name="kevinprelim1">{{cite web|author=Max Mayfield|year=1991|title=Hurricane Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/kevin/prenhc/prelim01.gif}}</ref><ref name="kevinprelim2">{{cite web|author=Max Mayfield|year=1991|title=Hurricane Prelim 2|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/kevin/prenhc/prelim02.gif}}</ref>
However, a well-defined eye reappeared in the system and Kevin reintensified to a low-end Category 4 hurricane with maximum winds of {{convert|115|mi/h|km/h|0|abbr=on}} and a minimum pressure of 960 mb on [[October 7]]. But this was short-lived and on [[October 8]] the hurricane began to weaken again and on [[October 9|the next day]] it had entered into the North Central Pacific basin as a waning [[Saffir-Simpson Hurricane Scale|Category 1]] hurricane. After this crossing, it was subsequently downgraded to storm strength the same day and on [[October 11]], to a depression. It dissipated that same day. The remnant circulation, however, did persist a while longer as it slowly drifted north to finally lose its identity late on [[October 14]]. Kevin had been a hurricane for 12½ days while over the Eastern Pacific basin. This is the longest a system has remained as a hurricane in the basin since improved satellite imagery began.<ref name="kevinprelim2">{{cite web|author=Max Mayfield|year=1991|title=Hurricane Prelim 2|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/kevin/prenhc/prelim02.gif}}</ref><ref name="kevincp">{{cite web|author=Central Pacific Hurricane Center|year=1991|title=Kevin report: Central Pacific|publisher=CPHC|accessdate=2006-12-22|url=http://www.prh.noaa.gov/cphc/summaries/1991.php}}</ref>
There were no reported casualties or damages from Kevin.<ref name="kevinprelim2">{{cite web|author=Max Mayfield|year=1991|title=Hurricane Prelim 2|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/kevin/prenhc/prelim02.gif}}</ref>
<div style="clear: both"></div>
=== Hurricane Linda ===
{{infobox hurricane small
| name=Hurricane Linda
| category=cat3
| type=hurricane
| track=Linda 1991 track.png
| image=1991 Hurricane linda.JPG
| formed=[[October 3]]
| dissipated=[[October 14]]
| highest winds=120 [[miles per hour|mph]] (195 [[kilometres per hour|km/h]])
| lowest pressure=957 [[Bar (unit)|mbar]]<ref name="andresprelim1">{{cite web|author=Max Mayfield|year=1991|title=Tropical Strom Andres Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/andres/prenhc/prelim01.gif}}</ref>}}
The tropical wave that ultimately produced Hurricane Linda emerged from the northwest coast of [[Africa]] on [[September 16]]. It could be tracked reasonably well across the tropical [[Atlantic ocean|Atlantic]]. The convection increased markedly upon approaching the [[Lesser Antilles]] on [[September 21]]. The northern part split from the wave and caused showers in [[Jamaica]], [[the Bahamas]] and [[Cuba]] while the southern part continued and crossed [[Panama]] into the [[Pacific]] basin on [[September 25]] as a group of disorganized cloud clusters. It took many days to organize and it was not until [[October 3]] when organization improved and the wave became Tropical Depression Fourteen-E that same day.<ref name="lindaprelim1">{{cite web|author=Hal Gerrish|year=1991|title=Hurricane Linda Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/linda/prenhc/prelim01.gif}}</ref>
The tropical depression moved toward the northwest while strengthening and became [[Tropical Storm]] Linda within 12 hours. As Linda then drifted to the north it was upgraded to a hurricane on [[October 5]]. Then, the hurricane reached its estimated peak intensity of {{convert|120|mi/h|km/h|-1|abbr=on}} and a minimum central pressure of 957 mb that same day. Linda began to weaken as it was following Kevin's track and entered to colder waters. Linda turned the west-northwest and produced {{convert|80|mi/h|km/h|-1|abbr=on}} sustained winds on [[Socorro Island]] on [[October 7]] as the center of Linda was only {{convert|50|nmi|km|-1}} from the island. Later that day, Linda weakened to a [[tropical storm]]. On [[October 9]], as Linda was following Kevin's track, the cyclone had been sheared near the center and it had been downgraded to a depression, although deep convection continued to intermittently appear. Finally, on early [[October 14]], Linda dissipated.<ref name="lindaprelim1">{{cite web|author=Hal Gerrish|year=1991|title=Hurricane Linda Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/linda/prenhc/prelim01.gif}}</ref><ref name="lindaprelim2">{{cite web|author=Hal Gerrish|year=1991|title=Hurricane Linda Prelim 2|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/linda/prenhc/prelim02.gif}}</ref>
There were no reported casualties or damages from Linda.<ref name="lindaprelim2">{{cite web|author=Hal Gerrish|year=1991|title=Hurricane Linda Prelim 2|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/linda/prenhc/prelim02.gif}}</ref>
<div style="clear: both"></div>
===Hurricane Marty===
{{infobox hurricane small
| name=Hurricane Marty
| category=cat1
| type=hurricane
| track=Marty 1991 track.png
| image=Marty 1991.JPG
| formed=[[October 7]]
| dissipated=[[October 18]]
| highest winds=80 [[miles per hour|mph]] (130 [[kilometres per hour|km/h]])
| lowest pressure=979 [[Bar (unit)|mbar]]<ref name="martyprelim3">{{cite web|author=Lixion Avila|year=1991|title=Hurricane Marty Prelim 3|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/marty/prenhc/prelim03.gif}}</ref>}}
A series of weak tropical waves, of relatively short wave length, exited the [[Africa]]n during the last part of September. They traveled across the [[Atlantic]] and the [[Caribbean]], encountering a hostile environment for development. On [[October 5]], one of the waves crossed [[Central America]] and it began to organize [[October 6|the next day]].
Based on satellite classifications, the weather system was upgraded to tropical depression status about {{convert|240|nmi|km|-1}} south of the [[Gulf of Tehuantepec]] on [[October 7]]. It became [[Tropical Storm]] Marty [[October 8|the next day]] and reached hurricane status early on [[October 10]] while moving parallel to the coast of [[Mexico]]. There were several occasions when an eye was becoming apparent in satellite imagery but it never fully developed. An upper trough over the western [[United States of America|United States]] forced Marty to moved toward the northwest and north for a while, bringing the hurricane to waters previously cooled by hurricanes Kevin and Linda. Then, Marty disorganized and weakened into a tropical storm. Also, the trough which forced Marty northward moved out of the area, which made that Marty turned sharply to the west, then west-southwest around a high pressure system. Marty weakened further and remained as a tropical depression. It finally dissipated on [[October 18]]. There were no associated casualties or damages with Marty. <ref name="martyprelim1">{{cite web|author=Lixion Avila|year=1991|title=Hurricane Marty Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/marty/prenhc/prelim01.gif}}</ref>
<div style="clear: both"></div>
===Hurricane Nora===
{{infobox hurricane small
| name=Hurricane Nora
| category=cat2
| type=hurricane
| track=Nora 1991 track.png
| image=Hurricane Nora (1991).jpg
| formed=[[November 7]]
| dissipated=[[November 12]]
| highest winds=100 [[miles per hour|mph]] (160 [[kilometres per hour|km/h]])
| lowest pressure=970 [[Bar (unit)|mbar]]<ref name="noraprelim3">{{cite web|author=Miles Lawrence|year=1991|title=Hurricane Nora Prelim 3|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/nora/prenhc/prelim03.gif}}</ref>}}
A tropical wave organized into a tropical depression on [[November 7]]. It moved to the northwest and strengthened into Tropical Storm Nora the next day. On [[November 9]], Nora became the first hurricane to form in November in the northern East Pacific basin since the [[1950-1969 Pacific hurricane seasons#1966 season|1966 season]]. It peaked as a Category 2 hurricane on [[November 10]]. A large [[trough (Meteorology)|trough]] moved in from the west and formed a [[low pressure area|low]]. Shear increased and disrupted Nora's convection. The low also caused an abrupt change of course to the northeast. Nora weakened to a depression on [[November 11]] and dissipated the next day. Nora's remnants continued to the northeast, showing brief flare-ups of convection, causing rain in [[Sinaloa]] and [[Nayarit]]. Effects were minor. <ref name="noraprelim1">{{cite web|author=Miles Lawrence|year=1991|title=Hurricane Nora Prelim 1|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/nora/prenhc/prelim01.gif}}</ref><ref name="noraprelim2">{{cite web|author=Miles Lawrence|year=1991|title=Hurricane Nora Prelim 3|publisher=National Hurricane Center|accessdate=2006-12-22|url=http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/nora/prenhc/prelim02.gif}}</ref>
Hurricane Nora is one of only six known tropical cyclones to reach hurricane intensity east of the dateline in November or December. The other ones were [[1972 Pacific hurricane season#Hurricane/Typhoon Ruby|Hurricane/Typhoon Ruby]] in [[1972 Pacific hurricane season|1972 season]], [[Hurricane Iwa]] in the [[1982 Pacific hurricane season|1982 season]], [[1983 Pacific hurricane season#Hurricane Winnie|Hurricane Winnie]] in the [[1983 Pacific hurricane season|1983 season]], [[1997 Pacific hurricane season#Hurricane Rick|Hurricane Rick]] in the [[1997 Pacific hurricane season|1997 season]], and [[2006 Pacific hurricane season#Hurricane Sergio|Hurricane Sergio]] in the [[2006 Pacific hurricane season|2006 season]]. <ref name="80columndata">{{cite web|author=NOAA|year=1990|title=80columnreport|publisher=AOML|accessdate=2006-12-20|url=http://www.nhc.noaa.gov/tracks1949to2005_epa.txt}}</ref>
==Season statistics==
===Timeline===
<timeline>
ImageSize = width:800 height:150
PlotArea = top:10 bottom:30 right:20 left:20
AlignBars = early
DateFormat = dd/mm/yyyy
Period = from:01/05/1991 till:01/12/1991
TimeAxis = orientation:horizontal
ScaleMinor = grid:black unit:month increment:1 start:01/06/1991
Colors =
id:canvas value:gray(0.88)
id:GP value:red
id:TD value:rgb(0.38,0.73,1)
id:TS value:rgb(0,0.98,0.96)
id:C1 value:rgb(1,1,0.80)
id:C2 value:rgb(1,0.91,0.46)
id:C3 value:rgb(1,0.76,0.25)
id:C4 value:rgb(1,0.56,0.13)
id:C5 value:rgb(1,0.38,0.38)
Backgroundcolors = canvas:canvas
BarData =
barset:Hurricane
bar:Month
PlotData=
barset:Hurricane width:10 align:left fontsize:S shift:(4,-4) anchor:till
from:12/05/1991 till:16/05/1991 color:TS text:"Andres"
from:14/06/1991 till:22/06/1991 color:TS text:"Blanca"
from:16/06/1991 till:27/06/1991 color:C3 text:"Carlos"
from:24/06/1991 till:29/06/1991 color:C1 text:"Delores"
from:29/06/1991 till:30/06/1991 color:TD text:"Five-E"
from:15/07/1991 till:20/07/1991 color:C1 text:"Enrique"
from:29/07/1991 till:08/08/1991 color:C3 text:"Fefa"
from:04/08/1991 till:10/08/1991 color:C1 text:"Guillermo"
barset:break
from:08/08/1991 till:14/08/1991 color:TS text:"Hilda"
from:12/09/1991 till:13/09/1991 color:TD text:"Ten-E"
from:16/09/1991 till:19/09/1991 color:TS text:"Ignacio"
from:20/09/1991 till:02/10/1991 color:C4 text:"Jimena"
from:25/09/1991 till:11/10/1991 color:C4 text:"Kevin"
from:03/10/1991 till:14/10/1991 color:C3 text:"Linda"
from:07/10/1991 till:18/10/1991 color:C1 text:"Marty"
from:07/11/1991 till:12/11/1991 color:C2 text:"Nora"
barset:skip
bar:Month width:5 align:center fontsize:S shift:(0,-20) anchor:middle color:canvas
from:01/05/1991 till:01/06/1991 text:May
from:01/06/1991 till:01/07/1991 text:June
from:01/07/1991 till:01/08/1991 text:July
from:01/08/1991 till:01/09/1991 text:August
from:01/09/1991 till:01/10/1991 text:September
from:01/10/1991 till:01/11/1991 text:October
from:01/11/1991 till:01/12/1991 text:November
</timeline>
The season began with the formation of Tropical Depression One-E on [[May 16]] and ended with the dissipation of Tropical Depression Nora on [[November 12]]. One named storm formed in May, three in June, two in July, two in August, three in September, two in October, and one in November. Very unusually, a category 2 hurricane formed in November, when strong shear and cold waters are often present in the basin. This has happened only six times, incluiding Nora. <ref name="80columndata">{{cite web|author=NOAA|year=1990|title=80columnreport|publisher=AOML|accessdate=2006-12-20|url=http://www.aoml.noaa.gov/hrd/hurdat/tra51to05atl-gt.txt}}</ref>
===Accumulated Cyclone Activity (ACE)===
{|class="wikitable" align=right style="margin-left:1em"
|-
!colspan=6|ACE (10<sup>4</sup> kt²) – Storm
|-
! 1
| 52.14 || Kevin
! 8
| 6.00 || Guillermo
|-
! 2
| 33.3 || Jimena
! 9
| 5.50 || Delores
|-
! 3
| 22.13 || Carlos
! 10
| 3.51 || Enrique
|-
! 4
| 19.57 || Fefa
! 11
| 3.47 || Blanca
|-
! 5
| 10.34 || Linda
! 12
| 3.14 || Hilda
|-
! 6
| 7.62 || Marty
! 13
| 2.53 || Andres
|-
! 7
| 7.18 || Nora
! 14
| 1.92 || Ignacio
|-
!colspan=6|Total= 177.93
|}
The table on the right shows the [[Accumulated Cyclone Energy|ACE]] for each storm in the season. ACE is, broadly speaking, a measure of the power of the hurricane multiplied by the length of [[time]] it existed, so storms that last a long time, as well as particularly strong hurricanes, have high ACEs. ACE is only calculated for full advisories on tropical systems at or exceeding 34 knots (39 mph, 63 km/h) or tropical storm strength and it is used to rank hurricane seasons as above-normal, near-normal, and below-normal. It defines below-normal as having an ACE less than 95*10<sup>4</sup> kt²; It defines above normal as having an ACE above 150*10<sup>4</sup> kt² along with the numbers of any two of the following above average: [[tropical storms]] (15), [[hurricanes]] (9), or major hurricanes (4); It defines near-normal as having an ACE between 100*10<sup>4</sup> kt² and 150*10<sup>4</sup> kt², or an ACE above 150*10<sup>4</sup> kt² with fewer than two of the numbers of the following above average: tropical storms (15), hurricanes (9), or major hurricanes (4).<ref name="NOAAACE">{{cite web|url=http://www.cpc.ncep.noaa.gov/products/Epac_hurr/background_information.html|author=Climate Prediction Center|title=Background Information: East Pacific Hurricane Season|accessdate=2006-10-26}}</ref>
The cumulative ACE for the Eastern Pacific this season fell within the official "Above Normal" grading, being one of the most active. This occurred because the season had many intense storms that lasted for a long period of time, including Kevin that took almost the third part of the total season ACE, as it held hurricane status for 12½ days in the basin.<ref name="80columndata">{{cite web|author=NOAA|year=1990|title=80columnreport|publisher=AOML|accessdate=2006-12-20|url=http://www.aoml.noaa.gov/hrd/hurdat/tra51to05atl-gt.txt}}</ref>
<div style="clear: both"></div>
==1991 storm names==
The following names were used for named storms that formed in the eastern Pacific in 1991. The names not retired from this list were used again in the [[1997 Pacific hurricane season|1997 season]]. This is the same list used for the [[1985 Pacific hurricane season|1985 season]]. In previous seasons, "Delores" was spelled "Dolores", but it was misspelled this year. After this season, the typo was corrected. No central Pacific names were used; the first name used would have been Ekeka. Names that were not assigned are marked in <font color="gray">gray</font>.
{| width="90%"
|
* Andres
* Blanca
* Carlos
* Delores
* Enrique
* [[Hurricane Fefa|Fefa]]
* Guillermo
* Hilda
|
* Ignacio
* Jimena
* Kevin
* Linda
* Marty
* Nora
* <div style="color: #888;">Olaf (unused)</div>
* <div style="color: #888;">Pauline (unused)</div>
|
* <div style="color: #888;">Rick (unused)</div>
* <div style="color: #888;">Sandra (unused)</div>
* <div style="color: #888;">Terry (unused)</div>
* <div style="color: #888;">Vivian (unused)</div>
* <div style="color: #888;">Waldo (unused)</div>
* <div style="color: #888;">Xina (unused)</div>
* <div style="color: #888;">York (unused)</div>
* <div style="color: #888;">Zelda (unused)</div>
|}
==Retirement==
The [[World Meteorological Organization]] retired one name in the spring of 1992: Fefa. It was replaced in the [[1997 Pacific hurricane season|1997 season]] by Felicia.
==See also==
{{tcportal}}
*[[List of tropical cyclones]]
*[[1991 Atlantic hurricane season]]
*[[1991 Pacific typhoon season]]
*[[1990-91 Southern Hemisphere tropical cyclone season]]
*[[1991-92 Southern Hemisphere tropical cyclone season]]
*[[1990-1994 North Indian Ocean cyclone seasons]]
==References==
{{reflist|2}}
==External links==
* [http://www.nhc.noaa.gov/archive/storm_wallets/epacific/ep1991/ NHC 1991 Pacific hurricane season archive]
* [http://www.prh.noaa.gov/cphc/summaries/1991.php Central Pacific Hurricane Center archive]
* [http://www.nhc.noaa.gov/tracks1949to2005_epa.txt List of storms with ACE calculations]
* [http://ams.allenpress.com/archive/1520-0493/120/11/pdf/i1520-0493-120-11-2697.pdf 1991 North Eastern Pacific hurricane season summary]
{{1990-1999 Pacific hurricane seasons}}
[[Category:Pacific hurricane seasons|1991]]
[[Category:1991 Pacific hurricane season| ]]