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000
FXUS66 KSTO 281045
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
245 AM PST Tue Jan 28 2020

.Synopsis...
Precipitation chances continue today, mainly for areas north of
Sacramento. Otherwise, dry conditions expected this week for most
areas with above average temperatures. Precipitation chances may
return late this weekend, mainly over the mountains.

&&

.Discussion...
Lots of cloudiness continues to stream into NorCal from the west
and southwest as another trough swings onshore to our north across
the PacNW. Radar indicates the largest area of showers currently
over northwestern Shasta County extending westward toward the
north coast. All the cloud cover along with southerly winds of
5-10 kts have precluded fog development in the Central Valley.
Current temperatures remain rather mild, ranging from the upper
20s and 30s in the mountains to the mid 40s to mid 50s across the
Central Valley.

Weakening front will gradually work its way southeastward bringing
very light QPF about as far south as I-80 into this evening.
Highest amounts of 0.25 to 0.50 inches will be possible over
northern Shasta County. Little impact is expected with little to
no snow accumulation.

A ridge of high pressure builds in beginning mid-week resulting in
dry and mild conditions. Temperatures are forecast to gradually
warm for the second half of this week, reaching 10-15 degrees
above average by Friday. Northerly surface flow will likely be
strong enough to inhibit fog potential.

&&

.EXTENDED DISCUSSION (Saturday THROUGH Tuesday)...
Strong upper ridging progged over NorCal this weekend resulting
in dry weather with above normal temperatures. High temperatures
in the Central Valley projected to be upwards of 10 to 15 degrees
above normal. Night and morning valley fog will continue to be
possible Saturday. Upper ridging progresses and flattens Sunday as
upstream short wave trough moves through Interior NorCal. This
Pacific storm looks weak with some light precipitation possible
over the mountains and mainly northern portions of the Sacramento
Valley. High amplitude ridging follows inland Monday into Tuesday
for drier weather and breezy northerly wind.

&&

.AVIATION...
Lcl MVFR/IFR conds poss ovr Intr NorCal nxt 24 hrs in shwrs with
isold LIFR omtns obscrg trrn. Lcl Sly sfc wnd gsts to 25 kts poss
in Sac Vly tda. Wly flow alf with lcl sfc wnd gsts to 35 kts poss
ovr hyr mtn trrn, shftg to the NW aft 00z Wed.

&&

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

&&

$$




Previous Forecast Discussions may be found at
NWS Sacramento, CA (STO) Office Forecast Discussions.
(Click 'Previous Version' there to view past versions successively.
Some may differ only in time posted.)

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