Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 231210
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
410 AM PST Mon Jan 23 2017

.Synopsis...
Scattered showers and isolated thunderstorms with mountain snow
showers continue today. Drier weather Tuesday into the weekend
except for a slight chance of some light showers mid-week.

&&

.Discussion...
Upper trough moves overhead NorCal today with scattered showers
and a few thunderstorms. Snow has decreased across the northern
Sierra since Sunday evening, and additional snowfall accumulations
today are expected to be much lighter than over the weekend as off
and on snow showers continue through the day. Some light snowfall
accumulations will also be possible down into the foothills as
snow levels are around 2-3K ft.

Vertically stacked system presently off the Oregon coast forecast
to drift southeast and continue filling over the next 24-36
hours, skirting down the NorCal coast early Tuesday. Until then, a
chance of showers will continue across the region with only light
additional QPF.

Drier northerly flow sets up for Tuesday as upper ridging
approaches the West Coast and subsidence increases over Interior
NorCal. A weaker system moves through the ridge later Wednesday
into Thursday and may bring some light showers.

&&

.EXTENDED DISCUSSION (Friday THROUGH Monday)
Upper ridge builds into northern California on Friday and into
the weekend bringing dry weather and plenty of sunshine at least
in the mountains. The amount of sunshine in the Valley remains to
be seen, as fog and stratus may develop. Temperatures should begin
to increase, but temperatures will be dependent on how much fog
and stratus stick around. JClapp

&&

.AVIATION...
Isolated to scattered showers mainly southward of I-80 this
morning with a threat of showers across interior NorCal this
afternoon. Patches of MVFR ceilings along edges of Central Valley
and mainly IFR conditions over mountains today. Isolated
thunderstorms 20z to 03z valley and foothills. Ridging creeps into
area later Tuesday with an end to precip threat. JClapp

&&

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

&&

$$



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