Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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000
FXUS66 KHNX 251013
AFDHNX

Area Forecast Discussion
National Weather Service Hanford CA
313 AM PDT Sun Oct 25 2020


.SYNOPSIS...A cooling trend will continue over the next few days.
Temperatures will run below normal through Tuesday. A few light
showers and high elevation snow flurries will be possible over the
mountains Sunday night. A heightened fire danger will exist over
the mountains late Sunday into Tuesday due to locally gusty winds
and low humidity. A significant warm up is expected by the middle
of next week.

&&

.DISCUSSION...
Mainly clear skies across the central California interior. Lots of
marine stratus clouds covering much of the coastal areas across
the central and south CA coast due to closed upper trough just west
of the Channel Islands. Satellite images show the low moving
onshore through SCal near the Mexico border this afternoon. Models
show some precipitation across the coastal mountains of S CA today
but the deeper subtropical moisture remains towards Baja and AZ.
Breezy onshore winds will affect the mountain passes of the Kern
county mountains and desert today as the coastal trough moves
onshore. A stronger and much colder weather system will quickly
follow from the north later today. The Euro 00z model has trended
drier towards the GFS model solution with the next weather
system. Some of the higher resolution models continue to indicate
some light precipitation over the the Sierra and Tehachapi
mountains tonight. However water vapor satellite images show
little moisture with the trough pushing southward over NCal/NV.
Thus think precipitation potential will be limited and light if
any.

The low pressure system drops through the Great Basin area
bringing some colder and drier air across CA Monday with gusty
northeast winds. This will lower temperatures a few more degrees
across the area and more significantly will bring increased fire
danger across the mountain districts as humidities drop and winds
increase. Desert locations will also experience very low
humidities along with the gusty winds. These expected conditions
have prompted a Red Flag Warning for the mountain and foothill
areas as well as the desert zones from Sunday evening into
Tuesday. By Tuesday morning the colder air will lead to some of
our lowest overnight temperatures since last spring. Expect lows
to run around 10 to 15 degrees below normal with freezing
temperatures possible Tuesday morning in the Antelope Valley.

A ridge of high pressure is expected to build inland behind the
the exiting system, and by Wednesday temperatures will be back up
to around seasonal averages. Expect temperatures at or just
slightly above normal through the end of next week as the ridge
gradually moves across the region ahead of another approaching
weak low pressure system

&&

.AVIATION...
Local MVFR/IFR visibilities can be expected in smoke and haze
over the Sierra during the next 24 hours. VFR conditions will
otherwise prevail over the central California interior during this
time.

&&

.AIR QUALITY ISSUES...
Please see SFOAQAHNX for an Air Quality Alert

None.

&&

.CERTAINTY...

The level of certainty for days 1 and 2 is medium.
The level of certainty for days 3 through 7 is high.

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...
Red Flag Warning from 5 PM this afternoon to 5 PM PDT Tuesday
for CAZ298-299-590>597.

&&

$$

public...MV
aviation....Molina

weather.gov/hanford


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