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000
FXUS66 KSTO 061100
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
300 AM PST Sat Mar 6 2021

.SYNOPSIS...
Drier weather expected over the weekend, then unsettled weather
through the first half of next week with periods of rain showers
and mountain snow showers. Lingering showers possible over the
Sierra Nevada Thursday into Friday.

&&

.DISCUSSION...
Pacific frontal system pushing through interior NorCal early this
morning. Showers will be diminishing with drier weather expected
today. Additional light snow accumulations of 1 to 5 inches
possible in the Western Plumas mountains and northern Sierra
Nevada early this morning. Snow levels 4000 to 5500 feet. High
temperatures expected to be near to slightly below normal.

Next Pacific frontal system approaches NW CA Coast tonight, but
forecast to weaken as it moves inland early Sunday. Main impact
will be some associated cloudiness but no precipitation expected.
Near normal high temperatures are predicted Sunday.

Deep upper low in GOA Monday progged to dig along the West Coast
through the first half of next week. Embedded vort maxes will
rotate through CWA resulting in periods of rain showers and
mountain snow showers. Some increased CAPE depicted over the
Northern half of the Sacramento Valley Monday and southern half
Tuesday into Wednesday for a slight chance of afternoon
thunderstorms. Snow levels expected to be around 2500 to 3500
feet.

&&

.EXTENDED DISCUSSION (Wednesday THROUGH Saturday)...
GEFS ensembles and clusters in good agreement advertising
unsettled pattern through the end of next week. Initial system
progged to dropped south over the bay area Wednesday with light
showery rain in the Valley and light snow with an inch or two over
the mountains. Some uncertainty in placement of low over SoCal or
the desert Southwest Thursday, either solution will bring drier
conditions for NorCal. Ridge then is likely to build over the area
as shown in ensembles Thursday/Friday. High temperatures in the
mid/upper 50`s Wednesday will warm to the mid/upper 60`s Thursday-
Saturday. Unsettled conditions could return next weekend.


&&

.AVIATION...
Showers will exit the region by 6 am with a few areas of lower
ceilings continuing through the morning hours. VFR conditions will
return during the afternoon with light winds.

&&

.STO WATCHES/WARNINGS/ADVISORIES...
Winter Weather Advisory until 10 AM PST this morning for West
Slope Northern Sierra Nevada-Western Plumas County/Lassen Park.

&&

$$