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NWS Area Weather Forecast Discussion
County Warning Area [CWA]: STO
Regional NWS Weather Office: Sacramento, CA

000
FXUS66 KSTO 182120
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
120 PM PST Sat Nov 18 2017

.SYNOPSIS...
Dry weather through Sunday. Weak systems move through Monday
with another during mid week. Each of these systems will come
with light precipitation and high snow levels well above pass
levels.

&&

.DISCUSSION (Today through Tuesday)...
A ridge of high pressure will help to keep clear skies and cool
overnight temperatures once again tonight. A system well to the
west will help to keep most precipitation focused in the Pacific
Northwest the next several days. That system will merge with
another one that will drop down from Alaska on Monday when light
amounts of precipitation may make it`s way down as far south as
Sacramento.

For the most part any precipitation will be focused over the
north end of the valley and over the mountains. Snow levels will
be very high above pass levels so no travel problems are expected.
The further south you get in the Sacramento valley the less
likely you will be to see any precipitation through mid week.

&&


.EXTENDED DISCUSSION (Wednesday THROUGH Saturday)


Models are continuing to favor a ridge over CA for the start of
the extended forecast keeping precip to our north. Have continued
to trend PoPs downward but a few light showers in the higher
elevations will be possible for northern parts of the CWA on
Wednesday and Thursday. A weak front pushes southward Thursday
night into Friday and that will bring some shower chances for
mainly higher elevations. Snow levels will remain high and we are
not expecting any snow accumulation. Models want to bring in
another system next weekend but confidence in on the low side for
timing.

We will see a very mild start to the extended period with high
temperatures running anywhere from 5-15 degrees above normal.
Temperatures start to cool late week and will return to near
normal by next weekend.

-CJM
&&

.AVIATION...

Mainly VFR conditions expected the next 24 hours. There is a
slight chance for morning fog Sunday, local MVFR possible at
times for the southern terminals Sun 14-18z. Light winds expected
throughout the period.
&&

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

$$

Forecast Discussion from: NOAA-NWS Script developed by: El Dorado Weather




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