Area Forecast Discussion
Issued by NWS Sacramento, CA
FXUS66 KSTO 270519
Area Forecast Discussion
National Weather Service Sacramento CA
1015 PM PDT Sun Mar 26 2017
Pacific storm moves out of the area Monday morning bringing an end
to some showers and mountain snow. Drier Tuesday followed by a
threat of another weather system by midweek.
Heaviest precip drifting Ewd and mainly E of I-5 and moving up into
the Sierra. Before sunrise, the showers should be winding down over
the Sierra. A secondary wave will drop SEwd over the Nrn zones from
12z-18z Mon, and behind this system winds will shift NWwd which will
help erode the Valley low cloudiness. JHM
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
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.
Winter Weather Advisory until 5 AM PDT Monday for Western Plumas
Winter Weather Advisory from 8 PM this evening to 8 AM PDT
Monday for West Slope Northern Sierra Nevada.