Extreme weather
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[[Image:Trends in natural disasters.jpg|thumb|right|350px|Trends in natural disasters, [http://www.environmenttimes.net/article.cfm?pageID=122 Pascal Peduzzi (2004) "Is climate change increasing the frequency of hazardous events?" ''Environment Times'' UNEP/GRID-Arendal] ]]
{{seealso|List of extreme weather events}}
'''Extreme weather''' includes [[weather]] phenomena that are at the extremes of the historical distribution, especially [[severe weather|severe or unseasonal weather]].<ref>Intergovernmental Panel on Climate Change. [http://www.grida.no/climate/ipcc_tar/wg1/088.htm 2.7 Has Climate Variability, or have Climate Extremes,
Changed?] Retrieved on [[2007-04-13]].</ref>
==Related to significant tropical cyclones==
Increasing dramatic weather catastrophes are due to an increase in the number of severe events and an increase in [[population]] densities, which increase the number of people affected and damage caused by an event of given severity. The [[World Meteorological Organization]]<ref>Commondreams.org News Center. [http://www.commondreams.org/headlines03/0703-05.htm Extreme Weather Prompts Unprecedented Global Warming Alert.] Retrieved on [[2007-04-13]].</ref> and the [[U.S. Environmental Protection Agency]]<ref>U. S. Environmental Protection Agency. [http://yosemite.epa.gov/OAR/globalwarming.nsf/webprintview/ActionsIndustryInsurance.html Global Warming.] Retrieved on [[2007-04-13]].</ref> have linked increasing extreme weather events to [[global warming]], as have Hoyos ''et al.'' (2006), writing that the increasing number of category 4 and 5 hurricanes is directly linked to increasing temperatures.<ref>Carlos D. Hoyos, Paula A. Agudelo, Peter J. Webster, Judith A. Curry. [http://www.sciencemag.org/cgi/content/abstract/1123560v1 Deconvolution of the Factors Contributing to the Increase in Global Hurricane Intensity.] Retrieved on [[2007-04-13]].</ref> Similarly, Kerry Emmanuel in ''Nature'' writes that hurricane power dissipation is highly correlated with temperature, reflecting [[global warming]]. Hurricane modeling has produced similar results, finding that hurricanes, simulated under warmer, high CO<sub>2</sub> conditions, are more intense than under present-day conditions. [[Thomas Knutson]] and Robert E. Tuleya of the [[NOAA]] stated in 2004 that warming induced by [[greenhouse gas]] may lead to increasing occurrence of highly destructive category-5 storms.<ref>Thomas R. Knutson, ''et al.'', [[Journal of Climate]], [http://www.gfdl.noaa.gov/reference/bibliography/2004/tk0401.pdf ''Impact of CO<sub>2</sub>-Induced Warming on Simulated Hurricane Intensity and Precipitation: Sensitivity to the Choice of Climate Model and Convective Parameterization''], 15 Sept. 2004. Retrieved March 4, 2007.</ref> Vecchi and Soden find that [[wind shear]], the increase of which acts to inhibit [[tropical cyclones]], also changes in model-projections of global warming. There are projected increases of [[wind shear]] in the tropical Atlantic and East Pacific associated with the deceleration of the [[Walker circulation]], as well as decreases of wind shear in the western and central Pacific[http://www.gfdl.noaa.gov/~gav/ipcc_shears.html]. The study does not make claims about the net effect on Atlantic and East Pacific hurricanes of the warming and moistening atmospheres, and the model-projected increases in Atlantic wind shear. <ref>{{cite journal |last= Vecchi |first= Gabriel A. |coauthors= Brian J. Soden |date= [[2007-04-18]] |title= Increased tropical Atlantic wind shear in model projections of global warming |journal= [[Geophysical Research Letters]] |volume= 34 |issue= L08702 |pages= 1–5 |doi= 10.1029/2006GL028905 |url= http://www.gfdl.noaa.gov/reference/bibliography/2007/gav0701.pdf |format= PDF |accessdate= 2007-04-21}}</ref>
==See also==
*[[Climate change]]
*[[Effect of sun angle on climate]]
*[[Global warming]]
*[[List of disasters]]
*[[List of extreme weather events]]
*[[List of tornadoes and tornado outbreaks]]
*[[Storm]]
*[[U.S. state temperature extremes]]
*[[Weather-related fatalities in the United States]]
*[[Rogue wave (oceanography)]]
==References==
{{reflist|2}}
==External links==
*[http://www.heatisonline.org/weather.cfm The Heat is Online: Extreme Weather Events]
*[http://www.ab-maps.com/weather/main.asp Weather]
*[http://www.bbc.co.uk/weather BBC weather page]
*[http://www.ncdc.noaa.gov/oa/reports/weather-events.html NCDC weather events page]
*[http://www.bom.gov.au/lam/climate/levelthree/c20thc/temp1.htm Marble Bar heatwave, 1923-1924]
*[http://www.severewx.co.uk/ Severe Weather UK]
*[http://www.extremeweathermag.com/ext/default.aspx Extreme Weather magazine]
[[Category:Weather hazards|weather]]
[[el:Ακραίο καιρικό φαινόμενο]]
[[ja:異常気象]]
[[no:Ekstremvær]]
[[nn:Ekstremvêr i Noreg]]
[[fi:Äärimmäiset sääilmiöt]]