Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 161048
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
348 AM PDT Sat Sep 16 2017

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

&&

.DISCUSSION...
High clouds are moving across NorCal early this morning as the
next upper trough approaches. Current temps are pretty similar to
24 hours ago and range from the 30s in the mountain valleys to the
upper 50s to mid 60s in the Central Valley.

Dry weather with slightly warmer temperatures will persist through
the weekend under northwest flow.

Cooler weather will return early next week as deep trough moves
into the PacNW. NorCal will be on the southern fringe with
precipitation chances mainly limited to areas near the Oregon
border. The main impacts for much of the region will be cooler
weather and breezier conditions.

&&

.EXTENDED DISCUSSION (Wednesday THROUGH Saturday)
Upper level trough will be the dominant feature for the west
coast in the extended forecast. Models continue to show that much
of the precipitation will stay north of our region, however, we
could see slight chances for shower activity on Wednesday and
Thursday across Shasta County mountains into the Sierra. The most
notable impact from the trough pattern will be cool temperatures.
Daytime highs on Wednesday and Thursday will range 5 to 15 degrees
lower than average and some portions of higher terrain could see
a bit of a snow dusting with this cooler airmass. Valley highs in
the 70s to low 80s and highs over the mountains and foothills
ranging 50s to low 70s (mid 40s near the Sierra Crest).
Temperatures will warm by the end of the week as the trough tracks
eastward. Breezy periods will be possible at times during the
trough passage.

&&

.AVIATION...
VFR conditions continue across interior NorCal. Winds will remain
generally below 10 kt at TAF sites.

&&

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

&&

$$



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