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The southwest monsoon



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Definition of monsoon... Any wind that reverses its direction seasonally.

The peak period for monsoonal related thunderstorm activity in southern California is from mid July through early September.

Usually the monsoonal pattern is produced by an area of high pressure over the four corners. The clockwise flow around the high draws the moisture north/northwest into the southwest...including the deserts and mountains of southern California. At times the high over the four corners will move slightly east or westward. If the high moves west...the normal result is an increase in thunderstorm activity over southern California.

Below is a diagram of what was explained above...

Click the diagram to enlarge

The monsoon at times will be enhanced by a wave moving along the southeasterly flow or increase moisture from a tropical system.

The three greatest threats from monsoonal related thunderstorms are...

Storm Photos from Past Monsoon Seasons...
Click for safety information...
Thundestorm/Rainfall... Current/Forecast Information
Additional information on the "Monsoon"

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