Weather Talk: Thunderstorm activity peaks in the Southwest in July, August
July and August is the time of the American monsoon.
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.
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