Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 251047
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
347 AM PDT MON APR 25 2016

.Synopsis...
Unsettled and cool weather today, then again Tuesday night and
Wednesday.

&&

.Discussion...
Skies have cleared out across most of interior NorCal early this
morning as the upper trough is shifting east into Nevada. Breezy
north winds, with local gusts over 30 mph, have spread southward
through much of the Sacramento Valley overnight as the Medford to
Sacramento gradient has hovered around 7.5 to 9 mbs. Temperatures
are in the upper 20s to mid 30s in the mountains with 40s and
lower 50s elsewhere.

Another batch of energy will slide southward into NorCal from the
PacNW today as the center of the trough moves over Nevada. This
may bring some additional showers to the extreme southern Cascade
Range and the northern Sierra, but the remainder of the region
will be dry.

Gusty north winds will increase across the Central Valley this
morning with some areas expected to see gusts around 40 mph by
late morning. Gradients begin to relax some by mid-afternoon and
winds may drop off by late in the day. A wind advisory has been
issued.

Short-wave ridging moves over NorCal on Tuesday with dry and
warmer weather, along with lighter northerly flow, expected. The
dry weather looks short-lived as another system moves into the
region Tuesday night and Wednesday. Wednesday`s system should
bring a little more precipitation to the region with the best
chances continuing over the foothills and mountains.

Have left out any mention of thunderstorms for now given model
uncertainly on how fast the cold closed upper low moves through,
but at this point perhaps a low probability for some on Wednesday
looks possible. Several inches of snow also looks possible near
pass levels.

Drier northerly flow returns Thursday on the backside of this
system with only a slight chance of lingering showers over the
northern Sierra Nevada.

&&

.Extended Discussion (Friday thru Monday)...
High pressure will build into the area on Friday and remain in
control of local area through early next week, bringing dry
weather and warming temperatures. High temperatures will near the
90 degree mark in the Valley by Sunday. Models showing a weak
system dropping SE into the Great Basin with a few showers across
the Sierra, south of US 50, on Saturday, but moisture is limited
so have kept dry forecast at the moment. This system will serve to
strengthen northerly flow though, so locally breezy winds not out
of the question for the weekend. CEO

&&

.Aviation...
VFR conditions for TAF sites next 24 hours. Breezy surface winds
today with gusts to 25-35kts in the Valley. A few showers possible
across the Sierra with local MVFR conditions.

&&

.STO Watches/Warnings/Advisories...
Wind Advisory from 8 AM this morning to 5 PM PDT this afternoon
for Carquinez Strait and Delta-Central Sacramento Valley-
Northern Sacramento Valley-Northern San Joaquin Valley-Southern
Sacramento Valley.

&&

$$



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