Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 261030
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
330 AM PDT MON SEP 26 2016

.SYNOPSIS...
Dry weather continues. Above average temperatures through
Tuesday, then cooling trend begins Wednesday.

&&

.DISCUSSION...
Clear skies early this morning with strong ridging along the West
Coast. Offshore flow continues with many spots in the Sierra
foothills seeing easterly winds gusting 15-30 mph. Temperatures
are mostly on the mild side ranging from the upper 30s in the
mountain valleys to the 60s through the Central Valley. Many
foothill locales are in the 70s to around 80.

Offshore flow will weaken by this afternoon, but it will be
another hot day across interior NorCal with triple digits possible
through the Central Valley. The North Valley may shed a few
degrees compared to Sunday as north winds slacken in the
afternoon. Readings on Tuesday are expected to be very similar to
today.

The ridge shifts east Wednesday and Thursday as another trough
develops off the coast of the PacNW. Temperatures will return to
average for late-September as onshore flow increases.

&&

.EXTENDED DISCUSSION (Friday THROUGH Monday)
A cool upper level trough from the Gulf of Alaska will bring much
cooler temperatures next weekend and a slight chance of
precipitation over the northern mountains.

Friday highs are expected to be 5 to 10 degrees below normal,
generally around 80 in the Valley. The weekend looks even cooler
as the trough moves on-shore. Waves embedded within the trough
will bring the potential for some showers over the northern
mountains. Moisture with this cool system is quite limited so not
expecting to see significant precipitation at this point.

The main effects of the trough are expected to be much cooler
temperatures, especially compared to this past weekend. Valley
highs are expected to be limited to the 70s. There could also be
some breezy winds in the mountains. EK

&&

.AVIATION...
VFR conditions over interior NorCal next 24 hours. Generally
light winds today, except local gusts to 20-30kt through Sierra
canyons and over ridges through 14z. EK

&&

.STO Watches/Warnings/Advisories...None.

&&

$$



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