Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 122201
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
301 PM PDT Sat Aug 12 2017

.SYNOPSIS...Seasonable temperatures through the weekend with
a cooling trend early next week.
&&

.DISCUSSION...
Satellite images show little change in the pattern with a dry W-SW
flow continuing across CA. Thus near persistence conditions
expected with near seasonable temperatures and dry weather for the
remainder of the weekend.

Models indicate a change in pattern for early in the week. An
upper trough moving through the Pacific Northwest and northern
California will dig south into southern California Monday and
Tuesday resulting in a cooling trend. A stronger onshore flow
should provide breezy conditions in the valley monday afternoon
and gusty winds below coastal passes and especially the Kern
county mountain passes and desert.

Much of the district should see cooler temperatures below normal
Monday. The coolest day may be Tuesday with a North flow and
cooler air behind the trough.

Unfortunately the cooling will be short lived as upper level high
pressure over the eastern Pacific begins building east over
California Wednesday into the weekend. This will result in a
warming trend...with the potential for triple digits in the valley
as early as Thursday.

The medium range models are indicating a possible return of
monsoon moisture from the Great Basin into the Sierra Nevada late
next week. We have introduced a slight chance of thunderstorms
over the mountains Friday and Saturday and will continue to
monitor this closely and refine timing over.

&&

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

&&

.AIR QUALITY ISSUES...
On Sunday August 13 2017... Unhealthy for sensitive groups in
Fresno... Kern and Tulare Counties and Sequoia National Park and
Forest.
Further information is available at Valleyair.org

&&

.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...MV
avn/fw...BSO
prev discussion...Riley
synopsis...MV

weather.gov/hanford


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