Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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686
FXUS66 KHNX 242235
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
335 PM PDT Tue Apr 24 2018

.SYNOPSIS...Warm temperatures and dry conditions will continue
for the next few days as high pressure dominates. There will be
slight chances for afternoon showers and thunderstorms for the
higher elevations of the Sierra Nevada Wednesday and will
continue into the weekend as a low pressure system moves into
northern California. The main system impacts will be increased
winds and clouds for all other areas as the system moves through
the region.

&&

.DISCUSSION...
Some high clouds crossing the south valley from a disturbance off
Baja. Otherwise little change in temperature trends with near
persistence conditions to continue through tomorrow. Above normal
temperatures should prevail into Thursday. The marine layer has
deepen to 1200ft along the coast as the ridge has shifted E into
the Great basin. A shallow marine layer may cool parts Merced
county and west side but much of central CA will remain on the
warm side of the ridge. Models show some instability across
central CA each afternoon starting tomorrow thus isolated
convective storms may be possible each afternoon mainly over the
Sierra Nevada high country starting tomorrow. An upper trough will
move closer to the N CA coast Thursday. This will increase the
onshore flow and bring a deeper marine layer into the interior and
initiate a cooling trend by he weekend. The upper low will over N
CA on Friday increasing the onshore gradients across central CA.
Expect breezy to windy conditions especially below the mountain
passes on the west side of the San Joaquin Valley and the Kern
county mountains and desert starting Friday afternoon through
Saturday. Models in poor agreement for next week. The EC and Can
models maintains the low over CA through Sunday. While the GFS
prog it moving into the N Rockies. Models develop another upper
trough over the west early next week. Due to low confidence in
model guidance, opted to keep the threat for precipitation
activity confined to mainly the Sierra Nevada, where it is
climatologically favored. While more certainty regarding the
cooler temperatures remains.

&&

.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 high.
The level of certainty for days 3 through 7 is low.

Certainty levels include low...medium...and high. Please v
www.weather.gov/hnx/certainty.php for additional information
an/or to provide feedback.isit
www.weather.gov/hnx/certainty.php for additional information
an/or to provide feedback.

&&

.HNX Watches/Warnings/Advisories...
NONE.
&&

$$

public...MV
avn/fw...MV
synopsis...MV

weather.gov/hanford



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