Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 281143
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
443 AM PDT Fri Jul 28 2017

.SYNOPSIS...A strong upper level ridge of high pressure over
the Four Corners region will build into California during the
next several days and bring generally dry weather and above normal
temperatures. Isolated afternoon and evening thunderstorms are
possible near the Sierra crest through Saturday and could include
the rest of the mountains and desert for much of next week. &&

.DISCUSSION...
Thursday saw warming temperatures across central California, with
triple digit highs across the desert and most San Joaquin Valley
locales. Just a few showers/thunderstorms developed near the
Sierra crest yesterday afternoon and stayed mainly to the east.

We can expect similar conditions today as we remain in
southwesterly flow between a weak trough along the coast and the
strong upper ridge expanding westward near the Four Corners
region.

Models are similar and prog the ridge to continue to strengthen
overhead as it progresses westward. This will continue to produce
temperatures above normal across our area, warming to around 5-10
degrees above seasonal averages by the middle of next week.

As flow transitions from southwest to more southerly, some
moisture will likely impact our area, bringing more coverage of
convective activity over the mountains and including desert areas
by early next week. A weak disturbance in the easterly flow
around the bottom of the ridge can further enhance the chance for
convection over the mountains and desert by the middle of the
week.

&&

.AVIATION...
Areas of MVFR visibilities in smoke from the Detwiler wildfire near
Mariposa County. Isolated afternoon thunderstorms or rain showers
possible near the crest of the Sierra Nevada 21z-03z. Otherwise, VFR
conditions will prevail across the central CA interior during the
next 24 hours.

&&

.AIR QUALITY ISSUES...
On Friday July 28 2017... Unhealthy for sensitive groups in Fresno
and Kern Counties and Sequoia National Park and Forest.
Further information is available at Valleyair.org

Additionally...please see the SFOAQAHNX for an Air Quality Alert
for Mariposa and Tuolumne Counties.


&&

.CERTAINTY...

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
www.weather.gov/hnx/certainty.php for additional information
an/or to provide feedback.

&&

.HNX Watches/Warnings/Advisories...
NONE.
&&

$$

public...JEB
avn/fw...MV
synopsis...JEB

weather.gov/hanford


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