Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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FXUS66 KHNX 191128
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
328 AM PST Sun Nov 19 2017

.SYNOPSIS...
Onshore flow across the area this weekend will provide seasonal
temperatures and dry conditions along with the possibility of
valley morning fog. Weak cold front will clip Yosemite on Monday
with a few showers possible. Upper level ridge will build in with
a warm up through next weekend as temperatures reach above normal
levels and the area remains dry.

&&

.DISCUSSION...
Some thin high clouds crossing central CA from the Epac.
Otherwise mainly clear and dry conditions. Some patchy fog
starting to form in parts of the San Joaquin Valley and will
likely become more widespread in the morning with good radiational
cooling conditions and high dew points in the lower 40s. Parts of
the high desert like Ridge Crest and Edwards already cooled near
the freezing mark. A ridge over the Pacific Ocean off Mexico will
expand North and usher in a warm and dry trend today. A Weak
trough will move through North Ca Monday resulting in a slight
chance of light precipitation over the high country of Yosemite.
Models have been trending drier with this system. Otherwise
central CA will remain dry for the remainder of the week. High
cloud cover pushing across North CA early Monday should mitigate
the threat of dense fog towards the Merced area but remain more
prevalent in the South Valley.

Model in fair agreement for the Ridge to continue expanding North
through mid week. This will shunt moisture towards the Pac NW and
maintain warm and dry condition across the central CA interior for
the remainder of the week. Model temperature statistics now
indicating high temperatures in the lower to mid 70s across the
San Joaquin Valley during Thanksgiving Day. The only problem with
having such a strong ridge will be the stable atmosphere below it.
This will lead to persistent episodes of possible dense fog
across the valley. Even with limited precipitation from the latest
storms, the ridge pattern will lead to a growing inversion that
will trap to necessary ingredients for persistent fog into next
weekend.

&&

.AVIATION...
Areas of IFR in fog across the San Joaquin Valley until 18Z Sunday.
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 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...
Dense Fog Advisory until 10 AM PST this morning CAZ089>092.

&&

$$

public...MV
avn/fw...JDB
prev discussion...Molina
synopsis...MV

weather.gov/hanford


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