Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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000
FXUS66 KHNX 152147
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
247 PM PDT Tue Aug 15 2017

.SYNOPSIS...A warming trend begins tomorrow and continues into the
weekend. Otherwise...thunderstorms will be possible each afternoon
and evening through the weekend across the Sierra Nevada generally
from Sequoia National Park northward.

&&

.DISCUSSION...A dry cold front moved through central California
yesterday leaving behind upper level northwest flow ushering in
additional cool air. Temperatures this afternoon were generally
running between 5 and 8 degrees cooler compared to 24 hours ago.
Temperatures are forecast to warm another few degrees before
sunset...remaining between 5 and 7 degrees below normal for the
middle of August. The San Joaquin Valley has not seen daytime high
temperatures this cool since the middle of June...a full two
months.

Otherwise...the short term high resolution models are in good
agreement that the Sierra Nevada will see at least a shower or two
and possible isolated lightning strikes later this afternoon into
the early evening hours. The models have been pretty consistent
with this scenario...especially near the Yosemite National Park
area.

Temperatures will warm slightly on Wednesday as upper level high
pressure over the eastern Pacific begins to nudge slightly
eastward. Temperatures will still be between 3 and 5 degrees below
normal.

Additional warming is expected Thursday into the first part of the
weekend...with possible triple digits once again in the valley by
Friday.

Thunderstorms will be possible each afternoon and evening across
the Sierra Nevada...especially from Sequoia National Park
northward through the beginning of next week.

The operational GFS and ECMWF are in agreement that on Sunday an
upper low will close off near the central or southern California
coast...possibly bringing more widespread mountain showers. In the
least...this will knock down daytime high temperatures to more
seasonable values. We will continue to watch this closely and
update the forecast accordingly.

&&

.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
an/or to provide feedback.

&&

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

$$

public...Riley
avn/fw...99
synopsis...Riley

weather.gov/hanford



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