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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												Military Expenditures			Manganese Mines	Major Soil Orders													Major Karst 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	Class	Rank	Percent of GDP	Manganese Mines	Ultisols	Aridisols	Histosols	Entisols	Rocky Land	Alfisols	Spodosols	Gelisols	Inceptisols	Andisols	Vertisols	Mollisols	Ice/Glacier	Major Karst Regions












9.02%	23.9%	9.48%	11.8%	42.4%	27.6%	21.7%	21.0%	24.2%	14.9%	29.2%	7.65%				18.5	29.2%	9.16%	4.00%	5.44%	0.754%	6.87%	5.89%	3.80%	7.01%	1.28%	2.72%	23.6%	5.25%	6.25%

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