Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 250916

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
216 AM PDT Thu May 25 2017

.SYNOPSIS...A trough of low pressure will remain over the region
today and Friday with cool and breezy conditions for most
locations. High pressure will then build in over the region for
the upcoming weekend with a warming trend.


.DISCUSSION...Strong onshore flow and deep marine layer continue
early this morning with temperatures running as much as 18 degrees
lower than 24 hours ago where influenced by marine air. Winds are
also blowing rather strong through the Kern County Mountain and
far southern Sierra passes with the trough of low pressure over
the region. Satellite imagery shows a well developed mountain wave
cloud over the Indian Wells Valley and along the Sierra Crest in
the stronger westerly flow.

Today will be a much cooler day than Wednesday due to the above
mentioned reasoning and most lower elevations locations will reach
only into the upper 70s to lower 80s while the higher elevations
will cool just several degrees.

Very stable air has overspread the region in the northwest flow
aloft and there should be little to no chance of any thunder along
the Sierra crest.

As for pattern development for the next few days...models are in
very good agreement in building heights and a ridge over
California Saturday through Tuesday. This will allow for a big
warm up along with a daily threat of afternoon showers and
thunderstorms along the Sierra crest due to the combination of an
elevated heat source and ample snow melt or sublimation in the
boundary layer at the ridge line.

By mid week, the ridge is projected to move east allowing for
another trough of low pressure to edge into the area. This will
cool down temperatures as the onshore flow increases and heights
aloft diminish.


VFR conditions are expected across the central CA interior during
the next 24 hours.


On Thursday May 25 2017... Unhealthy for sensitive groups in
Fresno and Kern Counties.
Further information is available at



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

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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