Dense Fog in California, November 5, 2021

Area Forecast Discussion
National Weather Service Hanford CA
305 AM PDT Fri Nov 5 2021

.SYNOPSIS...Aside from a slight chance of showers in Yosemite
National Park this weekend, dry weather can be expected over
the central California interior through Monday with a minor day
to day cooling trend. A storm system will bring rain and high
Sierra snow to the district Monday night through Tuesday evening.
The remainder of next week will be dry with mild afternoons
along with areas of night and morning fog in the San Joaquin
Valley.

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.DISCUSSION...Residents in the Sierra foothills, much of the
southern San Joaquin Valley and the valley facing slopes of the
the Kern county mountains are waking up to cloudy skies this
morning. The clouds are the residual after effects of a diffuse cold
frontal passage Thursday afternoon. There'll be little more than
some drizzle out of these clouds in the upslope regions of the
Kern county mountains this morning. Otherwise, Thursday's frontal
system ended up as a dud in the precip department. A couple of
locations in the high Sierra got spritzed on with up to a few
hundredths of an inch of rain. Temperatures and dewpoints are
trending slightly lower throughout the CWA compared to 24 hours
ago and winds are light. We'll be watching for fog formation in
the San Joaquin Valley where skies are clear early this morning
but don't expect dense fog, if any, will be very widespread. Other
than that, today will turn out pretty nice albeit slightly cooler
than Thursday.

In the large scale picture, a dry southwesterly flow aloft will
reside over central California through the weekend. A couple of
short wave troughs will trek eastward through the northern part
of the state during the next 48 hours and although they could
clip Yosemite National Park with some light precip Saturday evening
and again Sunday night, much of our CWA will remain dry through
Monday with minor day to day cooling.

A much better opportunity for wet weather will come Monday night
through Tuesday from a storm system that moves through the Pacific
Northwest. Details at this time are still uncertain as to how
much precipitation this system brings into the central California
interior. The NBM looks more promising today that a wetting rain
will fall in much of the San Joaquin Valley by Tuesday evening,
especially north of Kern County. The probability of a tenth of an
inch of rain for select locations Tuesday are as follows:
           MCE...57%  FAT...50%  HJO...40%  BFL...22%

The ensembles forecast the aforementioned storm system to be a
quick mover. With the exception of a few lingering showers in
the mountains, precip should be a done deal by Tuesday night.
The Kern county desert will likely remain rain shadowed with this
storm system where gusty downslope west winds can be expected
Tuesday.

A dry northwesterly flow aloft will prevail in the wake of this
storm system Wednesday. The ensembles forecast the amplification
of an upper level ridge of high pressure over the Eastern Pacific
later next week. This ridge will dominate our weather pattern in
the 7 to 10 day period and bring mostly clear skies, light winds
and mild afternoon temperatures to the district. Areas of night
and morning fog will likely plague the San Joaquin Valley during
this period.

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.AVIATION...MVFR ceilings with local IFR in fog can be expected
along the west slopes of the Sierra and the north facing slopes
of the Kern county mountains until 18z today. VFR conditions will
prevail elsewhere over the central California interior during the
next 24 hours.

&&

.AIR QUALITY ISSUES...
On Friday November 5 2021... Fireplace/Wood Stove Burning Status
is: No Burning Unless Registered in Fresno... Kern... Kings...
Madera and Tulare Counties.
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.html for additional information
an/or to provide feedback.

&&

.HNX WATCHES/WARNINGS/ADVISORIES...
None.
&&

synopsis...Durfee
public/aviation/fw...Durfee
PIO/IDSS...DCH

weather.gov/hanford