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Atlas (Beta)

Thunderstorm Occurrence

North AmericaPhysical Environment

Thunderstorm occurrence in North America

Thunderstorms per year in North America: The highest occurrence region (light brown), includes Texas, Oklahoma, and Kansas. Western U.S.(California, Nevada), and northern Canada (Yukon, Northwest Territories), have the lowest occurrences (black).

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Thunderstorm Occurrence												European Monetary Union (“Euroland”)	Change in Urbanization			Areas at Risk of Soil Degradation				Major Territorial Acquisitions (U.S.)
100 and above	81–100	71–80	61–70	51–60	41–50	31–40	21–30	11–20	6–10	2–5	1 and below	Value	Class	Rank	Percentage of annual change	Areas of serious concern	Areas of some concern	Stable terrain	Nonvegetated land	Extent of U.S., 1803	Louisiana Purchase, 1803	West Florida, 1810–1813	British Cession, 1818	East Florida, 1819	Northern Maine, 1842	Texas Annexation, 1845	Oregon Country, 1846	Mexican Cession, 1848	Gadsden Purchase, 1853	Alaska, 1867	Hawaii, 1898












9.02%	23.9%	9.48%	11.8%	42.4%	27.6%	21.7%	21.0%	24.2%	14.9%	29.2%	7.65%					23.0%	35.0%	31.0%	10.1%	91.6%	79.0%	7.81%	30.8%	98.3%	16.6%	50.1%	57.7%	66.4%	12.6%	63.8%	91.5%

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