Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 191116

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
416 AM PDT Tue Sep 19 2017

Temperatures will lower to several degrees below normal for the
next couple of days then even cooler by Thursday. Breezy
conditions will continue through Thursday with gusty winds
through and below mountain passes. A few light showers are
possible over the Sierra Wednesday night through Friday with snow
showers above 8000 feet. A warming trend is expected by the
weekend into early next week, with mostly clear skies.


An upper level trough is currently pushing into the Great Basin
area and bringing breezy conditions to central California, with
gusts over 50 mph across the ridges in Kern County. Winds are
gusting around 25 to 30 mph along the west side of the San Joaquin
Valley. There is limited moisture accompanying this system and
precipitation is not expected, but some upslope clouds are
developing along north and west facing slopes. Highs yesterday
were around normal for the end of Summer, and the passing trough
is expected to lower temps several degrees for today with breezy
conditions continuing.

Models maintain a broad trough and moderate onshore flow over the
region through Wednesday, keeping our conditions breezy with temperatures
a few degrees below climo. Additional energy dropping into the
trough is progged to swing a more significant front through our
area by Thursday and drop temperatures to around 10-15 degrees
below normal. Gusty winds will continue and there is enough
moisture progged with this trough to bring a chance for showers
over the Sierra zones, with snow levels down around 8000 ft. These
showers lingering into Friday are expected to bring just generally
light accumulations of snow at the highest elevations.

As the trough slides slowly east through the weekend and an upper
ridge amplifies along the Pacific coast, flow will turn offshore
and a warming trend will return for the early part of next week.
This will produce dry conditions with temperatures climbing back
to near normal for the first week of Autumn.


Areas of MVFR and local mountain obscuring IFR in upslope clouds in
the Grapevine area thru 18Z today. Otherwise, VFR conditions can be
expected over the Central CA interior during the next 24 hours.





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.


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