Area Forecast Discussion
Issued by NWS Sacramento, CA

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000
FXUS66 KSTO 222229
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
329 PM PDT THU SEP 22 2016


.SYNOPSIS...
A slight chance of showers or thunderstorms across the northern
mountains and Sierra into the evening then dry through the middle
of next week. Breezy north winds through the weekend. Slightly
below normal temperatures Friday then well above normal over the
weekend and into next week.

&&

.Discussion...
A cool upper low is shifting eastward through into Nevada with
some showers over the Sierra. Instability has been enough to touch
off a few weak thunderstorms in the Sierra and upper foothills,
mainly around I80. Brief periods of heavy rain with small hail are
possible. Snow levels have come down low enough for some wet snow
over the Sierra crest, with some light accumulations over the
higher peaks. This showers are shifting to the south and east. A
few showers many linger through the evening, with dry weather
overnight.

Most of the area is dry and sunny, though noticeably cooler on
this Autumnal Equinox. Temperatures in the Valley were in the
lower 50s and even the 40s, and similar lows are expected on
Friday. Mountain peaks and mountain basins will again drop below
freezing tonight, and some spots may be even cooler than this
morning. this taste of Autumn will be brief, though. Upper level
ridging brings dry and increasingly warm temperatures, rising to
near normal levels Friday, and well above normal for the weekend.
Sunday afternoon could see triple digits return to the northern
Sacramento Valley.

Some breezy north winds have developed over the northern and
central Sacramento Valley this afternoon as high pressure ridging
builds in behind the departing low. Winds may gust to 20 to 25 mph
this afternoon and early evening. EK
.EXTENDED DISCUSSION (Monday THROUGH Thursday)

Strong high pressure from EPAC forecast to impact Interior NorCal
through early part of extended forecast period. High temperatures
expected to be 5 to 10 degrees above normal into Monday. Upper
high shifts into the Great Basin Tuesday as offshore frontal
system moves into Pacific Northwest, lingering into Wednesday.
Deeper troughing pushes into the West Coast towards the end of the
week. Dry weather expected with main impact for Interior NorCal
being a gradual cooling trend with increasing onshore flow. High
temperatures expected to return to near normal by Thursday.
&&

.AVIATION...

Nly flow alf as upr low movs E and EPAC upr rdg blds inld. VFR conds
ovr Intr NorCal nxt 24 hrs exc isold MVFR poss NE mtns/Siernev in
-shra/-tsra thru 05z Fri.
&&

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

$$



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