Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 262325 AAA

Area Forecast Discussion...Updated
National Weather Service Hanford CA
425 PM PDT Tue May 26 2020

Updated Air Quality Issues section

Near record heat is likely in the San Joaquin Valley today
through Thursday. Wednesday and Thursday will be the hottest days
with afternoon highs as much as 15 to 20 degrees above their
typical values for the end of May. Temperatures will return to
seasonal readings this weekend. A Pacific weather system will move
into Northern California early next week for a small chance of
showers over parts of the north.


The effects of the omega block over the area have begun to be felt
as temperatures across the San Joaquin Valley and Desert locations
already in the low to mid 90s. Temperatures will continue to climb
throughout the afternoon with just below record highs expected.

Tomorrow the ridge axis will be parked over the state with will
increase heights further, leading to even higher temperatures
tomorrow and Thursday. Before the ridge slides closer to the Four
Corners region on Friday allowing for a cooling trend. Still, now
through Thursday excessive heat is expected.

An excessive heat warning is in effect for the San Joaquin Valley,
Sierra Nevada foothills, and the Coastal Range through Thursday.
Also, another excessive heat warning has been issued for tomorrow
and Thursday for the Kern County Desert, with the hottest
temperatures expected in the Indian Wells Valley.

As the omega weakens on Friday into Saturday, the western low
pressure will begin to round the ridge. This will allow for not
only a substantial cooldown, but bring a modest amount of moisture
into the northern half of the state. Not expecting a lot of
precipitation out of this, but should increase cloud cover and
enhance some cooling on Saturday.

As the aforementioned low ejects out of the area, another
shortwave will round the western side of the ridge keeping a
troughy pattern in place. Allowing for temperatures to continue to
cool a few degrees. Overall, could see a 20 degree swing in high
temperature between today and Monday.


VFR conditions will prevail across the interior of Central
California through at least the next 24 hours.


On Wednesday, May 27th, 2020, unhealthy for sensitive groups in
Fresno, Kern, Kings, Madera, and Tulare 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
and/or to provide feedback.


Excessive Heat Warning until 7 PM PDT Thursday for CAZ179>191.

Excessive Heat Warning from 11 AM Wednesday to 7 PM PDT Thursday
for CAZ198-199.



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