Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 182137 CCA
AFDHNX

Area Forecast Discussion...CORRECTED
National Weather Service San Joaquin Valley - Hanford CA
137 PM PST Mon Dec 18 2017

.SYNOPSIS...High pressure next 2 days with near normal
temperatures for the California interior. Next weather system
arrives Wednesday with a chance for precipitation, in the form of
snow, in the Sierra-Nevada Mountains. The San Joaquin Valley will
be generally dry and breezy on Wednesday.

&&

.DISCUSSION...A few interesting features this forecast period for
central California. Tonight and Tuesday weather will be benign
with above normal temperatures on Tuesday, a very pleasant day
overall.

A fast moving trough moves into the Pacific Northwest and
northern California coast, which begins to impact central
California by Wednesday morning. This will push a cold front
through the entire forecast area by mid/late Wednesday morning.
Cloud development is expected along and just behind frontal
passage. Models also display some jet energy, albeit weak, by
Wednesday afternoon. Thinking is that scattered show showers
develop above 3Kft in the Sierra. Precipitation could be more
widespread in a short window Wednesday afternoon from Kings Canyon
to Yosemite National Parks.

Otherwise, this wave moves through quickly with clearing by
Wednesday evening. Exception would be the higher Sierra and Kern
County Mountains with some upslope moisture lingering overnight.
Otherwise, it will turn cold Wednesday night with freezing surface
temperatures by Thursday morning. Model data suggests middle/upper
20s for lows Thursday morning, followed by lower/middle 20s by
early Friday morning for the San Joaquin Valley. Therefore, will
issue a Hard Freeze Watch for the valley beginning midnight
Thursday, then again Thursday night into early Friday. Confidence
for more impact Freeze is actually higher for Friday morning.

Extended forecast looks fairly quiet with highly amplified ridge
reestablishing itself just off the west coast of the United
States. This will keep the coldest air just east of the Sierra-
Nevada range. As a result, expecting dry and similar conditions to
what central California has experienced so far in the month of
December. The aforementioned ridge should maintain its position
through next weekend. Nights will be quite cool with near normal
daytime high temperatures.

&&

.AVIATION...VFR conditions will generally prevail through Tuesday
and Tuesday night across the central California interior. Surface
winds will remain light until Wednesday. Cloud cover will also
increase by Wednesday.

&&

.AIR QUALITY ISSUES...
On Monday December 18 2017... Fireplace/Wood Stove Burning Status
is: No Burning Unless Registered in Fresno... Kern... Kings...
Madera... Merced and Tulare Counties. 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...
Hard Freeze Watch from late Wednesday night through late
Thursday night CAZ089>092.

&&

$$

public...KPL
avn/fw...KPL
synopsis...KPL

weather.gov/hanford


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