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

000
FXUS66 KSTO 261030
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
330 AM PDT Wed Apr 26 2017

.SYNOPSIS...
Weak weather system will bring light precipitation today. Dry
with gusty north winds developing late in the week.

&&

.DISCUSSION...
Clouds and even a few light showers have been increasing across
interior NorCal overnight as the latest weather system moves into
the region. Current temperatures are considerably milder compared
to 24 hours ago and generally range from the mid 30s to mid 40s in
the mountains with mainly 50s elsewhere.

Only light amounts of precipitation are expected across the region
into this evening as the system slides down in west-northwest flow
over the eastern Pacific ridge. Rain totals in the valley will
likely only amount to a few hundredths of an inch while some
northern Sierra locales may see between a quarter and half an
inch. Snow levels will be above 8K feet through the event, so
little or no impact to travel expected through the higher northern
Sierra passes.

Amplifying upper air pattern forecast across western North America
beginning Thursday as the trough deepens to our east around the
Four Corners region by Saturday while upstream ridging over the
eastern Pacific edges onto the West Coast. This will bring a
return of dry and milder weather to interior NorCal along with
periods of breezy north winds to the Central Valley.

$$

.EXTENDED DISCUSSION (Sunday THROUGH Wednesday)
High amplitude upper ridging in the EPAC extends over Interior
NorCal through the weekend resulting in dry conditions with above
normal temperatures. Ridging may weaken some over northern
portions of CA Monday as a short wave trough digs through the
PACNW into the Great Basin. This could bring minor cooling over
northern portions of the forecast area Monday. High pressure
rebuilds behind the wave Monday night into Tuesday resulting in a
return of gusty northerly wind. Breezy conditions continue into
Wednesday as ridge axis shifts inland and temperatures increase to
upwards of 15+ degrees above normal.

&&

.AVIATION...
Moist NWly flow alf with lcl MVFR/IFR poss in pcpn, mnly omtns
til arnd 09z Thu. Lcl Sly sfc wnd gsts up to 25 kts poss in the
Cntrl Vly tda and lcl SW-W sfc wnd gsts up to 35 kts poss ovr hyr
trrn.

&&

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

&&

$$

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




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