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    Ken Clark

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    Monsoon Moisture for Arizona and Southern California

    August 16, 2010; 12:55 PM ET

    Moisture has increased in portions of the Southwest over the past 24 hours. This is in response to an easterly wave moving across northern Mexico. The water vapor satellite picture from AccuWeather.com Pro site shows the moisture (in green) and the easterly wave (over the northeast Baja)

    This easterly wave will progress west slowly tonight and tomorrow taking moisture with it into southern California. The increase in moisture is mainly in the middle layers of the atmosphere and will produce some clouds as it moves west. It will also be responsible for scattered showers and thunderstorms. The more widespread activity will be over the higher elevations of Arizona and Utah, but spotty thunderstorms can occur in the lower deserts as well. This will be mostly tonight and tomorrow in Arizona and mostly tomorrow and tomorrow evening in southeastern California. There also can be an afternoon thunderstorm in portions of the mountains of Southern California tomorrow and maybe a stray one in the deserts.

    Moisture will start to be forced back to the east on Wednesday. However, it will not be quick enough to rule out another afternoon thunderstorm over portions of the mountains and deserts of Southern California. A shower and thunderstorm will be scattered around Arizona Wednesday just like tomorrow. By Thursday, expect more a southwest flow and Southern California and even western Arizona should dry out some more.

    The views expressed are those of the author and not necessarily those of AccuWeather, Inc. or AccuWeather.com


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