Thunder and Lightning Storm

A rainstorm with thunder and lightning.

Basics of the Arizona Monsoon and Desert Meteorology

From the Arizona State University Climate Office.

Arizona resides within the North American Monsoon geographical arena. The monsoon season typically begins in early June when active thunderstorms build in central and southern Mexico. In mid- to late June, the thunderstorms move toward the International Border and into Arizona. The monsoon is a season where the dry, westerly winds (winds coming from the west) that typically persist through fall, winter and spring shift to moist, southerly winds (winds coming from the south). The incoming moisture helps build thunderstorm activity across the state.

Arizona Emergency Information Network (AzEIN)

The State of Arizona's official source for emergency updates, preparedness advice and hazards information, and related resources.

Use this site for comprehensive information regarding all forms of emergency and extreme weather conditions in the State of Arizona.

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