Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 212025

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
125 PM PDT Mon Aug 21 2017

An area of low pressure will remain anchored off the southern
California coast through Wednesday to continue the chance of
mainly afternoon showers and thunderstorms over the Sierra each
day. A dry westerly flow aloft will return by Thursday, with
temperatures slowly warming through the weekend.


A weak upper level low pressure area continues to spin near the
southern California coast. This is providing a southeast flow
across the region. This flow is drawing some moisture up from the
south, but the deeper moisture is staying east of our area.
However, there is enough moisture and instability over the Sierra
Nevada for afternoon thunderstorms again this afternoon. With the
moisture staying farther east, have removed any POPs from the Kern
county mountains and desert for today.

By Tuesday, models begin to pivot the upper low eastward and it
is forecast to push inland across the region on Wednesday and
weakening as another trough of low pressure moves across the
Pacific Northwest. This will shift the better moisture farther to
the east and thunderstorm chances will be limited to the higher
Sierra elevations north of Kern County on Wednesday as flow aloft
becomes more westerly. High pressure is then progged to build over
the region, for dry conditions Thursday through the beginning of
next week.

Temperatures will remain near normal under the influence of the
nearby low pressure area through Wednesday. Then temperatures
will warm several degrees by the end of the week with highs in the
San Joaquin Valley in the triple digits through the weekend.


.AVIATION... Isolated to scattered thunderstorms will occur
over the Sierra until 04z this evening and again after 20z
Tuesday. Otherwise VFR conditions can be expected over much
of the central CA interior during the next 24 hours.


Please see SFOAQAHNX for an Air Quality Alert




The level of certainty for days 1 and 2 is high.
The level of certainty for days 3 through 7 is high.

Certainty levels include low...medium...and high. Please visit for additional information
an/or to provide feedback.


.HNX Watches/Warnings/Advisories...


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