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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”)	Areas at Risk of Soil Degradation				Ecological Regions: Level 1 Regions
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	Areas of serious concern	Areas of some concern	Stable terrain	Nonvegetated land	Arctic Cordillera	Tundra	Taiga	Hudson Plain	Boreal forests	Northwestern forested mountains	Marine west coast forest	Eastern temperate forests	Great Plains	Deserts and steppes	Mediterranean California	Southern semi-arid highlands	Temperate sierras	Tropical wet forests

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%	1.96%	6.84%	22.1%	11.9%	32.1%	29.3%	5.59%	34.8%	38.2%	26.9%	39.7%	6.89%	11.3%	14.5%

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