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Courtesy the National Severe Storms Laboratory

American Monsoon

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news Grand Forks,
Grand Forks ND 2220 South Washington

July and August is the time of the American Monsoon.  During June and early July, the desert areas from northern Mexico northward into the Rocky Mountain States heat up from day after day of sunny weather.  Temperatures reach well into the 100s at lower elevations, and sometimes into the 110s and 120s in parts of Arizona and California.  The hot air becomes less dense (with lower barometric pressure).  During July and August, air moves in from all around in response to the lower pressure, but mountain ranges block much of this movement except for a stream of tropical air from the eastern Pacific which comes by way of the Gulf of Baja.  The higher humidity in this air leads to frequent thunderstorm activity over the mountains of the Southwest.  Ironically, this is also the peak of the Southwestern fire season as some of the mountain storms produce lots of lightning and very little rain.   Meteorologist John Wheeler

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