Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 181052
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
352 AM PDT Wed Oct 18 2017

.SYNOPSIS...Above normal temperatures will continue today then
trending much cooler through Friday as a storm system moves over
northern California. This system will bring a chance for light
precipitation Thursday night and Friday along with an increase in
winds. Dry weather will return this weekend with a warming trend
into early next week.

&&

.DISCUSSION...Satellite imagery shows an upper disturbance still
passing over central California early this morning. KHNX radar is
detecting some weak echoes across the southern San Joaquin Valley
but no precipitation is occurring. The moisture remains in the
mid levels as regional ASOS observations are clear below 12K feet.
The short wave will shift east of the area this afternoon with
diminishing cloud cover. Otherwise, temperatures will again climb
to around 4-8 degrees above normal this afternoon.

A sharp pattern change will occur to end the work week as an upper
trough drops down from the Gulf of Alaska. The models continue to
keep the bulk of the moisture and dynamics to our north, but there
is a chance for some light precipitation. Conditions should remain
dry through Thursday afternoon then a slight chance of precipitation
arrives in Yosemite NP in the evening. Chances increase and spread
south overnight into Friday morning. The trough axis is expected to
quickly shift east by Friday afternoon with just a few lingering
upslope showers possible in the Tehachapi mountains and foothills.
Rainfall will be light with QPF generally less than a tenth of an
inch. Snow levels will start out around 10000 feet then lower to
near 8500 feet in Yosemite NP Friday morning. Snow amounts should
mainly be from a dusting to one inch.

Winds will begin increasing on Thursday as the onshore pressure
gradient ramps up. Gusty winds are expected through and below the
passes in eastern Kern County and could reach advisory levels on
Friday. Breezy conditions will develop in the San Joaquin Valley
as well on Friday. Winds will diminish on Saturday.

Temperatures will lower to near normal on Thursday then several
degrees below normal on Friday. The cooler air mass will not last
long as strong high pressure begins to build in from the Pacific.
Highs are forecast to be back near normal by Sunday then several
degrees above normal early next week.

&&

.AVIATION...
Areas of MVFR visibilities due to smoke and haze can be expected
in the San Joaquin Valley, southern Sierra foothills and higher
elevations of the southern Sierra Nevada for at least the next 24
hours, with VFR conditions prevailing elsewhere across the Central
California Interior.

&&

.AIR QUALITY ISSUES...
On Wednesday October 18 2017...Unhealthy for sensitive groups in
Kern County. Further information is available at Valleyair.org

&&

.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...DCH
avn/fw...Bean
synopsis...DCH

weather.gov/hanford


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