Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 162236

Area Forecast Discussion
National Weather Service Sacramento CA
336 PM PDT Fri Mar 16 2018

Unsettled weather today into Saturday with showers, possible
afternoon thunderstorms, and moderate to heavy mountain snow
showers. Drier Sunday into Monday, then wet weather returns next
Tuesday into Friday.


Heavy snow snow showers continues today, with I80 closed much of
the day due to poor visibility and heavy snow. Currently I80 is
still closed, Highway 50 has just been opened with chain controls.
Travel over the Sierra is not recommended through tonight.
Scattered snow showers will gradually diminish in intensity after
midnight, but road conditions may still be poor even after the
Winter Storm Warning expires at 5 am Saturday. Check road
conditions at before considering travel in the
mountains. About an additional foot to foot and a half is
expected in the Sierra tonight into Saturday. The mountains of
Shasta County could see an additional 1 to 3 inches,western Plumas
County/Lassen Park could see another 2 to 5 inches of snow. Snow
levels will drop further, with light accumulations down into the
foothills possible.

Sunshine with cold air aloft from a cold core low is bringing
scattered afternoon showers and thunderstorms. These are expected
through around 7 pm, especially on the central and east side of
the Valley, extending into the foothills. Some of these storms
could be strong, and could generate large amounts of small hail.

Isolated Valley showers are possible Saturday as the upper low
gradually exits to the east, with snow showers at 2000-2500 feet.
Any accumulations should be light. Sunday should be mainly dry
and a little warmer. Monday will be mainly dry, except for a
slight chance of showers over the northern mountains as a weak
disturbance passes through. EK


.EXTENDED DISCUSSION (Tuesday THROUGH Friday)A Pacific storm
system will move into NorCal beginning Tuesday. Models continue to
slow down the system a touch with a slight chance of high
elevation showers Tuesday before precipitation becomes more
widespread overnight Tuesday. Daytime highs Tuesday should warm a
bit up to just slightly under normal for this time of year.
Relatively light precipitation moves into the north state Tuesday
night. Moderately high snow levels, generally above 5000 feet,
combined with light snowfall should keep mountain travel impacts
to a minimum. A subtropical moisture tap will push northward into
NorCal on Wednesday, increasing the rain and snow rates. Snow
levels Wednesday will remain relatively high, but heavier snowfall
at pass levels could cause Sierra travel issues. Moderate to
heavy precipitation continues into Thursday before turning more
showery Thursday night and Friday as the main upper through drops
into the Pacific Northwest. Snow levels during this time will drop
down to 3500 to 4500 feet, but precipitation should be becoming
lighter by this time.



Pacific disturbance will continue to bring showers with mountain
snow over interior NorCal next 24 hours. VFR occasional MVFR/IFR
conditions TAF sites with scattered thunderstorms this afternoon
and evening over the valley and foothills. Generally IFR/LIFR over
the mountains. Snow levels 2500 to 3500 feet. Southerly winds
generally below 10 knots at TAF sites with isolated gusts up to 20
kts in VCTS through the next 24 hours.


Winter Storm Warning until 11 PM PDT this evening for Western
Plumas County/Lassen Park.

Winter Storm Warning until 5 AM PDT Saturday for West Slope
Northern Sierra Nevada.

Winter Weather Advisory until 11 PM PDT this evening for Burney
Basin / Eastern Shasta County-Mountains Southwestern Shasta
County to Northern Lake County-Shasta Lake Area / Northern
Shasta County.


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