Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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000
FXUS66 KHNX 201115
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
415 AM PDT Wed Sep 20 2017

.SYNOPSIS...
Below normal temperatures will continue this week with further
cooling on Thursday. Breezy conditions will continue through
Thursday with gusty winds through and below mountain passes.
Showers are possible over the mountains Wednesday night through
Friday with light snow above 8000 feet. A warming trend is
expected this weekend through the middle of next week with mostly
clear skies.

&&

.DISCUSSION...Cooler air continuing to settle in across our area
behind a cold front which crossed Central CA Tuesday morning.
Temperatures are generally running 5-10 DEG F below Tuesday`s
readings under mostly clear skies. Meanwhile, increased onshore
p-grads have provided for breezy to windy conditions along ridge
tops and below the passes of the Kern County mountains and
Deserts. A wind advisory was posted until 800 AM PDT across
portions of the Kern County Mountains and Deserts as travel along
highway 58 has been impacted.

06Z WRF indicating a strong upper trough deepening along the
western CONUS coast tonight and pushing inland on Thursday which
will bring a re-enforcing shot of cooler air into our area and
will result in Thursday bring the coolest day across most of our
area since June 12 with afternoon highs across most of the San
Joaquin Valley only expected to reach the mid to upper 70s. This
system will also bring another period of breezy to locally windy
conditions to the Kern County Mountains and Deserts as p-grads
once again strengthen as well as a brief shot of precipitation to
the Southern Sierra Nevada mainly north of Kings Canyon. RH progs
have been trending toward increased moisture with this system so
have raised POPS for tonight and Thursday and have mentioned a
chance of showers for the southern Sierra foothills and a slight
chance for the eastern portion of the San Joaquin Valley.
Precipitation amounts are expected to be generally light with up
to a quarter inch of liquid precipitation possible in the
Southern Sierra Nevada north of Kings Canyon. Snow levels are
expected to be around 11000 feet at the onset of precipitation
this evening lowering to around 7000 feet by Thursday afternoon.
1-2 inches of snow will be possible along and near some of the
higher peaks in the Southern Sierra Nevada.

The trough is progged to remain over CA on Friday as the main
upper low center lifts slowly northward. Temperatures will remain
much below normal on Friday and there will be enough instability
along the Southern Sierra crest Friday afternoon and evening for
a few snow showers.

Temperatures will begin to recover over the weekend as the upper
trough moves to the east of our area and high pressure begins to
build inland. The medium range models are in fairly good
agreement with an upper ridge strengthening over CA through the
middle of next week. This will result in temperatures rising to
near to slightly above normal by next Tuesday. RH progs are
indicating little in the way of moisture from Saturday onward so
expect dry weather to prevail from the weekend through the middle
of next week.

&&

.AVIATION...Showers spreading over the southern Sierra Nevada and
Kern County mountains after 00Z Thursday, bringing areas of MVFR
and local terrain obscurations. Otherwise, VFR conditions can be
expected over 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...
Wind Advisory until 8 AM PDT this morning Caz093-099.

&&

$$

public...DS
avn/fw...JEB
synopsis...DS

weather.gov/hanford



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