Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 250010

Area Forecast Discussion
National Weather Service Hanford CA
510 PM PDT Thu Sep 24 2020

.UPDATE...Updated for air quality section.


High temperatures Friday afternoon will be a few degrees below
seasonal averages. A warming trend is expected this weekend into
early next week. Triple digit heat is likely in a portion of the
San Joaquin Valley, West Side Hills, and Kern County desert by
early next week. Dry weather will persist for the foreseeable


.DISCUSSION...Warmer than average temperatures will continue for
this afternoon, though temperatures have generally trended
slightly lower compared to this time yesterday. A dry southwest
flow prevails today and will become more westerly for tonight into
Friday due to the passage of a weak trough currently over
Northern California. As a result, temperatures are progged to
lower by several degrees on Friday, or about 3-5 degrees below
average. In addition, gusty winds are possible, or gusts around 45
to 50 mph, through and below the passes of the Tehachapi
Mountains. However, no precipitation will occur due to this
system. Enjoy this relatively cool weather, as it will be short-

During this weekend and early next week, temperatures will be on
the rise due to a strengthening ridge of high pressure along much
of the West Coast. So, expect continued dry conditions with no
precipitation until at least late next week. There will likely be
some weak easterly winds over the Sierra Nevada and adjacent
foothills, so it is possible the Central Valley could see a return
of hazy skies and reduced visibility at times due to smoke. While
the higher daytime temperatures will allow for lower humidity, we
are not expecting widespread poor overnight recoveries at this
time. A more noticeable increase in daily highs is expected by
Sunday and will further warm on Monday into Tuesday. So, by early
next week, high temperatures will top over 10 degrees above
average for most of the region and possibly near 15 degrees higher
than average in some locations. Near record high temperatures are
possible during next week. In addition, we expect this heat will
last into the latter part of next week, including into the
beginning of October, as the ridge expands and spreads further
north, while a high amplitude upper-level trough develops over
much of the Eastern U.S. Overall, models have been in decent
agreement, including over the last several runs.


IFR visibilities due to smoke and haze are likely in the Sierra
Nevada and adjacent foothills through at least Friday. Otherwise,
VFR conditions will prevail through at least the next 24 hours.


Please see SFOAQAHNX for an Air Quality Alert

On Friday September 25 2020... Unhealthy for sensitive groups in
Sequoia National Park and Forest.
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 high.

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




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