Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 171030
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
330 AM PDT Sun Sep 17 2017

.SYNOPSIS...
Dry with seasonable temperatures through the weekend. Cooler
weather with a chance of showers by mid-week.

&&

.DISCUSSION...
Skies are mostly clear across interior NorCal early this morning
except for some high cloud moving across the far northern portion
of the state. Current temperatures range from the mid 30s in the
mountain valleys to the mid 60s across milder portions of the
Central Valley.

Dry weather with similar temperatures to Saturday`s are expected
today.

Cooler weather will return Monday and continue through the week
as a deep upper trough moves into the Pacific Northwest. Northern
CA will be on the southern fringe, with precipitation chances
limited mainly to the mountains. The main impacts for much of the
region will be cooler temperatures (5-15 degrees below average)
and breezier conditions.

&&

.EXTENDED DISCUSSION (Thursday THROUGH Sunday)
Upper level trough over the west coast will dominate the weather
for interior NorCal during the extended forecast. The main impact
will be cool weather since models show that much of the
precipitation will remain north of our region except for some
isolated showers over mountains. Temperatures Thursday will be
10-16 degrees below average then 5-12 degrees below average on
Friday. The valley will see daytime temperatures in the mid 70s to
low 80s. Daytime temperatures in the foothills and mountains will
range from the 50s to the low 70s though some locations over the
Sierra crest may fall into the high 40s. Overnight temperatures
will be pretty chilly with mountain locations falling below 40
degrees.

The trough moves east of the area by the weekend so that daytime
highs will be near normal on Saturday. Valley highs will be
solidly back in the mid-80s on Saturday with additional warming to
the upper 80s and low 90s on Sunday.  JBB/HEC

&&

.AVIATION...
VFR conditions persist. Winds will remain below 10 kt at TAF
sites as onshore flow moves into interior NorCal.

&&

.STO WATCHES/WARNINGS/ADVISORIES...None.

&&

$$


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