During the summer months, the monsoon in the southwest U.S. and northwest Mexico gets cranking.
The term "monsoon" means seasonal change in wind pattern. In the southwestern United States, this seasonal change brings tropical air northward into Arizona. The wind, in essence, becomes a conveyor for rich, tropical moisture.
Sometimes, a Pacific or Atlantic hurricane or tropical storm will get caught in this monsoon flow.
Obviously, the addition of a dying tropical storm or hurricane into the standard summer pattern greatly increases rain chances.
Hurricanes and tropical storms: another source for enhanced monsoon activity!
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