Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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165
FXUS66 KHNX 202335
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
335 PM PST Tue Feb 20 2018

.SYNOPSIS...
Below normal temperatures and some showers mainly over the
mountains will persist through mid week. Stronger system may move
across the area early next week. A storm system will bring
precipitation into the district from late Thursday into Friday.
The weekend will bring dry weather and seasonable temperatures.

&&

.DISCUSSION...
A cold start to the day with much of district starting below
freezing. Some cumulus clouds building towards the sierra
foothills. Otherwise clear conditions across central CA. Low
temperatures tonight should run a bit warmer due to a short wave
moving south along the CA coast. This should bring some mid and
upper cloud cover for a period of time to mitigate the radiational
cooling tonight. But some of the colder locations in the San
Joaquin Valley locations may drop below freezing towards morning.
High resolution models also show some scattered precipitation
over the high sierra late tonight and Wednesday due to another
disturbance.

Otherwise the pattern remains amplified with a ridge extending
N-S over the central Pacific allowing a north flow out of W
Canada to push S into CA through the end of the week.

Another upper level disturbance will move South through the Pac
NW Wednesday night. This impulse will be stronger and models
indicate more moisture with it. However this morning models are
trending quite a bit drier. Generally light precipitation will
overspread the district later Thursday and continue into Friday as
it moves into central California. Snow levels will remain very
low during this period, so this feature will likely bring a
renewed threat of accumulating snow to the lower foothills and
Tehachapis. At this time, snowfall amounts of a dusting to an inch
or two are possible in the Sierra foothills with a general 2 to 4
inch accumulation possible over the higher elevations of the
Sierra.

We`ll get a break from precipitation Friday night through the
weekend thanks to weak ridging aloft. Temperatures should finally
warm to near normal during this period with dry weather and
mostly clear skies.  The models forecast another short wave
trough to drop southward into California early next week. Although
there are timing differences, the timing consensus for
precipitation may be late Tuesday.

$$

&&

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

&&

$$

public...MV
avn/fw...Dudley
prev discussion...Durfee
synopsis...MV

weather.gov/hanford



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