Weather Service Report

FXUS66 KHNX 241012

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
312 AM PDT Mon Jul 24 2017

Temperatures will be around seasonal averages through Wednesday,  
then back above normal for the remainder of the week. A moist 
southerly flow will bring a chance of thunderstorms to the 
mountains and Kern Desert through Tuesday, with just a few 
lingering storms possible over the Sierra crest Wednesday. 


A few thunderstorms have developed over the Sierra Nevada crest
Sunday afternoon as temperatures climbed back into the triple
digits across the San Joaquin Valley. An area of convection
is moving northward from Mono County into western Nevada early
this morning. Some of the clouds associated with this band of
convection have moved into the Sierra Nevada from Fresno County
northward and an isolated shower or thunderstorm is possible near
Yosemite early this morning. This band will continue to move 
north and out of the region this morning, but additional moisture
will move into the region today. 

The moisture is moving northward in the southerly flow between a 
weak shortwave trough along the northern California coast and the 
ridge over the southwest US. This will increase thunderstorm 
chances over the Sierra as well as the Kern County mountain and 
desert areas today and Tuesday. As the weak trough moves across 
northern CA, it will help to bring a slight decrease in
temperatures during the next couple of days, bringing temperatures
back to near normal for late July.

The weak upper low over northern California will move northeast 
and weaken further on Wednesday, allowing the ridge to begin 
expanding westward again. This will return the flow to more 
southwesterly and push moisture farther east. Thus, by Wednesday 
there should be just a slight chance for lingering storms near the
Sierra crest.

For the latter part of the week into the weekend, the ridge will
be in control with temperatures trending back upward to a few 
degrees above normal. Expect temperatures to be 100 to 104 degrees 
in the San Joaquin Valley Thursday through Sunday. There are some
model indications that moisture will also edge westward again, 
bringing at least a slight chance for thunderstorms back to the 
high Sierra by next Sunday and Monday.


Areas of MVFR visibilities in smoke from area wildfires. Isolated to 
Scattered thunderstorms developing this afternoon after 19z Monday 
over the Sierra Nevada and Kern county mountains and desert. 
Otherwise, VFR conditions will prevail across the central CA 
interior during the next 24 hours.


Please see SFOAQAHNX for Air Quality Alert.

On Monday July 24, 2017...Unhealthy for sensitive groups in Kern 



The level of certainty for days 1 and 2 is medium.
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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