Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 172104
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
204 PM PDT Thu Aug 17 2017

.SYNOPSIS...Near normal temperatures with the possibility of
Sierra Nevada thunderstorms each afternoon and evening through the
forecast.

&&

.DISCUSSION...Upper level high pressure over the Eastern Pacific
began to build east into California this afternoon...resulting in
a warming trend across the area. Temperatures across the area were
generally between 5 and 8 degrees warmer compared to 24 hours ago
and are expected to climb to seasonable normals.

Cumulus clouds are building over the Sierra Nevada...but still
remain pretty flat. One small shower was observed near Yosemite
National Park in the past hour...but quickly dissipated. The high
res ARW and NMM indicate an uptick in activity through the early
evening hours. Any storms that do form will move to the west
southwest. This may mean some clouds will drift into the foothills
and possibly the valley this evening. Out of the next 5 or so
days...today looks like the least amount of thunderstorms activity
over the Sierra.

Continued subtle warming is expected Friday and Saturday...with
temperatures a few degrees above normal. These are also the two
days where a few San Joaquin Valley locations could see
temperatures reach the triple digits.

Thunderstorms will be possible both Friday and
Saturday...especially from Sequoia National Park northward.

An upper low will develop off the central and southern California
coastline on Sunday and begin to move slowly southwest into
Tuesday. This will increase thunderstorm coverage over the Sierra
Nevada and possibly into the desert Sunday into the first part of
the week. We will continue to monitor this closely and update the
forecast accordingly.

Last...but not least...the forecast still calls for sunny skies
across the valley and maybe just a few clouds over the mountains
for the partial solar eclipse. We were initally a bit concerned
with the upper low forming offshore...however with the southwest
movement...it should not be an issue.

&&

.AVIATION...
VFR conditions will prevail across the central CA interior during
the next 24 hours.

&&

.AIR QUALITY ISSUES...
None.

&&

.CERTAINTY...

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

&&

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

$$

public...Riley
avn/fw...Bentzien
synopsis...Riley

weather.gov/hanford



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