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Thunderstorm Occurrence

North AmericaPhysical Environment

Thunderstorm occurrence in North America

NOAA

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”)

Internally Displaced Persons

European Union (EU)

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

People

Value

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%91.6%79.0%7.81%30.8%98.3%16.6%50.1%57.7%66.4%12.6%63.8%91.5%
0.16.0