Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 191800

Area Forecast Discussion
National Weather Service Sacramento CA
1100 AM PDT Mon Mar 19 2018

Dry weather continues today with milder temperatures. Wet weather
returns Tuesday and continues into the weekend.


Mostly clear skies prevail across interior Northern California
this morning as a shortwave ridge builds across the state.
Temperatures dropped into the 30s across the Valley early this
morning, but are rebounding quickly. Expect high temperatures this
afternoon in the mid to upper 60s across the Valley, with 30s to
50s over the mountains.

Our next storm system is currently spinning near 35N 140W and
slowly moving toward the region. Increasing moisture and warm
advection may lead to a few sprinkles as early as tonight, though
most of the precipitation will hold off until during the day
Tuesday. The atmospheric river is likely to make landfall across
central and southern California, whereas our forecast area will be
on the northern periphery of the storm. For Tuesday, expect mainly
light to moderate precipitation with high snow levels.

Heavier precipitation forecast to begin Wednesday night and
continue Thursday as deeper moisture moves north into NorCal ahead
of the approaching cold front and upper trough. Snow levels will
initially be rather high, 6500-7500 feet, but will tumble to below
4000 feet behind the front by later Thursday. Periods of moderate
to heavy precipitation will be possible, particularly over the
mountains. Gusty winds are also possible on Wednesday across the



Large upper low off the PacNW Coast will send embedded vort max
across Interior NorCal Friday keeping showers in the forecast.
Main upper low then digs across northern portions of CA Saturday,
continuing unsettled weather. Drier NWly flow sets up across the
CWA Sunday into Monday. Temperatures warm gradually through the
extended forecast period approaching slightly below normal by



Upr trof movs thru this mrng then upr rdg blds inld thru tngt.
VFR conds ovr Intr NorCal nxt 24 hrs with sfc wnds blo 12 kts.



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