Extreme weather

Extreme weather includes weather phenomena that are at the extremes of the historical distribution, especially severe or unseasonal weather. [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.]

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 [Commondreams.org News Center. [http://www.commondreams.org/headlines03/0703-05.htm Extreme Weather Prompts Unprecedented Global Warming Alert.] Retrieved on 2007-04-13.] and the U.S. Environmental Protection Agency [U. S. Environmental Protection Agency. [http://yosemite.epa.gov/OAR/globalwarming.nsf/webprintview/ActionsIndustryInsurance.html Global Warming.] Retrieved on 2007-04-13.] 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. [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.] 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 CO2 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. [Thomas R. Knutson, "et al.", Journal of Climate, [http://www.gfdl.noaa.gov/reference/bibliography/2004/tk0401.pdf "Impact of CO2-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.] 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. [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]

ee 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
*U.S. state temperature extremes
*Weather-related fatalities in the United States
*Rogue wave (oceanography)


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]

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