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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	Volcanoes														Regions of Weaker-Performing Cities
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	Cleveland	Hood	Hualalai	Kilauea	Mauna Loa	Novarupta	Okmok	Redoubt	Shishaldin	Spurr	St. Helens	Vsevidof	Westdahl	Yellowstone	Regions of Weaker-Performing Cities












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	1	2	1	14	3	1	1	1	2	1	2	1	1	1	48.8%

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