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North American Monsoon

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NASA Looks at the North American Monsoon

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What is the North American Monsoon?

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North American Monsoon Arrives, Season Runs June 15-September 30

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The North American Monsoon: Chapter 1 - Gila Bend to Phoenix

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First pre-monsoon thunderstorms of the North American monsoon season 2017

The North American monsoon, variously known as the Southwest monsoon, the Mexican monsoon, the New Mexican monsoon, or the Arizona monsoon, is a pattern of pronounced increase in thunderstorms and rainfall over large areas of the southwestern United States and northwestern Mexico, typically occurring between July and mid September. During the monsoon, thunderstorms are fueled by daytime heating and build up during the late afternoon-early evening. Typically, these storms dissipate by late night, and the next day starts out fair, with the cycle repeating daily. The monsoon typically loses its energy by mid-September when drier and cooler conditions are reestablished over the region. Geographically, the North American monsoon precipitation region is centered over the Sierra Madre Occidental in the Mexican states of Sinaloa, Durango, Sonora and Chihuahua.
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