Area Forecast Discussion
Issued by NWS San Joaquin Valley, CA

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000
FXUS66 KHNX 260926
AFDHNX

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
226 AM PDT Tue Sep 26 2017

.SYNOPSIS...
Dry weather will continue this week with temperatures climbing to
a few degrees above normal. Temperatures will lower back to near
normal this weekend with a cooler onshore flow and increased winds.

&&

.DISCUSSION...
Northerly flow aloft continues over California with an upper ridge
over the eastern Pacific and a long wave trough over the western
interior. The ridge will slowly build inland to the north through
Wednesday while an upper low forms over the lower Colorado River
Valley. This will continue the warming trend of the last few days.
High temperatures are forecast to be a few degrees above normal
by Wednesday then little changes through the end of the work week.
There is good model agreement with an upper trough moving over the
Pacific Northwest on Saturday. But the models then diverge Sunday
with the ECMWF tracking the trough east over the northern Rockies,
while the GFS digs it south over the Great Basin. For now, modest
cooling is forecast with temperatures back down near normal this
weekend. The GEM favors the ECM, but then drops another trough
over California early next week. The forecast remains dry but the
GEM solution suggests precipitation by next Monday as a cold front
moves in.

An offshore surface pressure gradient continues with some breezy
conditions over the mountains. An upper jet diving down from the
north will provide some upper level support. This could produce
an increase in winds with gusty northeast winds over the ridges
and through drainages into the foothills today through Wednesday
morning. The gradient relaxes later this week then turns onshore
Saturday with gusty westerly winds through and below the passes.

&&

.AVIATION...
VFR conditions will prevail throughout the central California
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...
NONE.
&&

$$

public...DCH
avn/fw...JDB
synopsis...DCH

weather.gov/hanford


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