Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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000
FXUS66 KHNX 200004
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
404 PM PST Mon Feb 19 2018

.SYNOPSIS...
Unseasonably cold weather will continue over the central
California interior through at least Wednesday in the wake
of a storm system over the Great Basin. Temperatures will
slowly moderate later this week. Isolated snow showers over
the foothills and mountains will diminish this evening, then
a chance for precipitation returns across the region during
midweek.

&&

.DISCUSSION...
Cold frontal system continues pushing through the region and
brought much cooler weather and gusty winds. The system is a
rather dry one but contains enough moisture to produce some
scattered mountain and foothill showers in the cool unstable air
behind the front. Snow levels have fallen below 2000 feet and
there has been some accumulating snow on the roadways in the
foothills causing travel difficulties. These showers will
dissipate with the loss of daytime heating and the winter weather
advisory for the foothill zones will expire at 4 pm. The Kern
County mountains will see upslope flow overnight and there could
be additional accumulating frozen precip as well as black ice
there. The Winter Weather Advisory continues in the Kern County
Mountains through 3AM Tuesday.

The cold dry air behind the front will allow temperatures in the
SJ Valley and foothill zones to drop dramatically overnight as the
skies clear out and winds abate. A Hard Freeze Warning is in
effect for these areas for tonight/Tue morning as temperatures
drop into the mid 20s across much of the area.

With the cold air in place expect overnight temperatures to dip
below freezing again wednesday night, however models continue to
show a weak shortwave dropping south through the area which may
help to mix the atmosphere and mitigate the temperature drop
somewhat. Models are also in agreement on additional shortwave
energy dropping into the Great Basin region by Thursday. This will
bring a chance for precipitation along with more gusty winds and
cool temperatures a few degrees again.

The remainder of the week through the weekend is progged to be
dry in west to northwest flow, with temperatures recovering to
around climo. Models show another system approaching by Monday
though there are differences on the strength and trajectory of
this system.



&&

.AVIATION...
Local mountain obcurations in snow showers along the sierra
foothills and Tehachapi mountains until 05z Tue. Otherwise, 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...
Winter Weather Advisory until 3 AM PST Tuesday CAZ095.

Hard Freeze Warning from midnight tonight to 8 AM PST Tuesday
CAZ089>094.

Freeze Watch from late Tuesday night through Thursday morning
CAZ089>094.

&&

$$

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

weather.gov/hanford



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