Area Forecast Discussion
Issued by NWS Sacramento, CA

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720
FXUS66 KSTO 262115
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
215 PM PDT Sun Mar 26 2017

.Synopsis...
Pacific storm moves through today into Monday bringing
some rain and mountain snow. Drier Tuesday followed by a threat
of another storm midweek.

&&

.Discussion...
Precipitation chances increase tonight when the heaviest
precipitation is expected to occur as the trough shifts
inland. By late evening travel over the crest should be
worsening. While not a big event there might be just enough
snowfall to cause travel issues.

Models indicate lingering showers on Monday for the western
slopes before ending Monday evening. Monday morning is when the
snow levels will be the lowest and likely below 4000 feet, but
by then the system will be near its end. 3-6 inches of new
snowfall above 4000 to 5000 feet with up to 10 inches across the
peaks looks possible. Rainfall amounts for the valley will be
less than a quarter inch with most places only measuring in the
hundredths to one quarter to three quarters of an inch for the
foothills and mountains.

Northerly winds will develop for Monday and Tuesday and may be
breezy. After a couple of cool days temperatures will warm into
the 70s on Tuesday in the valley and 50s in the mountains.
A weaker system than this current one will move through the
northern half of the CWA on Wednesday bringing with it a chance of
showers for that area.

&&
.EXTENDED DISCUSSION (Thursday THROUGH Sunday)


A brief shortwave trough is expected to move through the area
Thursday bringing precipitation mainly to the mountains, though
the Euro model is trending slightly more south with the system.
Low precipitation accumulation is expected with this system.
Ridging then builds over the west coast Friday into the weekend
leading to dry weather. Temperatures warm with the high pressure,
reaching into the upper 70s in the valley on Saturday. Mostly
northerly winds will persist through the weekend with locally
stronger winds.

HEC
&&

.AVIATION...


Weather system moves through NorCal over the next 24 hours.
Showers currently affecting KRDD and KRBL will spread to other
valley TAF sites by 0Z Monday, ending by 12Z Monday. TAF sites
expected to remain VFR with local MVFR possible vicinity showers.
Local southerly winds 10-15 kts 18Z- 02Z Monday.


&&

.STO WATCHES/WARNINGS/ADVISORIES...
Winter Weather Advisory until 5 AM PDT Monday for Western Plumas
County/Lassen Park.

Winter Weather Advisory from 8 PM this evening to 8 AM PDT
Monday for West Slope Northern Sierra Nevada.

&&

$$



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