Surges of moisture up the Gulf of California, through Rocky Point and into Arizona help enhance Monsoon storm development.
They happen when clusters of thunderstorms or even dying tropical systems get near the mouth of the Gulf.
The temperature under the cloudy area is cooler than that over Arizona's deserts. So, relatively speaking, the air will be rising over the deserts (hot air rises) much faster than the air under the cool, cloudy area at the mouth of the Gulf.
This causes air to begin flowing north through the Gulf.
And, since the water in the Gulf during the Monsoon is so warm, it evaporates quickly, resulting in humid air. That humid air flowing into Arizona helps spawn Monsoon storms.
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