Area Forecast Discussion
Issued by NWS Sacramento, CA
FXUS66 KSTO 292239
Area Forecast Discussion
National Weather Service Sacramento CA
339 PM PDT Wed Mar 29 2017
An approaching upper level disturbance will bring light rain for the
valley and light snow for elevations higher than 4000 feet. Gusty
north winds are likely Friday. Seasonably dry weather anticipated
for Saturday with chances for light rain in the Sierra Sunday.
.Short Term (Today through Saturday)...
The upper level ridge over the eastern Pacific is beginning to break
down as an upper level trough approaches from the northwest.
Satellite and radar imagery shows increasing clouds and some areas
of precipitation moving into the region across the northern
mountains and northern Sacramento Valley.
Forecast concerns this period include some light rain for the valley
and foothills with light snow for elevations higher than 4000 feet
starting tonight through Thursday night/Friday morning, and gusty
north winds on Friday. Model forecasts are in good agreement and
indicate the shortwave trough quickly moving through northern
California, which will start late tonight and last through Friday.
Little impacts are expected from the precipitation with only 1 to 2
inches of snow for the mountains and some wet roadways. A stronger
mid to lower level jet will be present across the area Friday, which
could translate to gusty north winds between 30 and 35 mph for the
valley and upwards of 45 mph for the higher terrain. Gusts will
start to diminish Friday evening.
Another upper level ridge will begin to build across the region and
will allow for dry seasonal weather to return with temperatures
between 5 and 10 degrees above normal.
.EXTENDED DISCUSSION (Sunday THROUGH Wednesday)
The extended period will be somewhat unsettled with a couple
weather systems expected to move through the area. A shortwave
will deepen as it moves over the northwest US on Sunday, bringing
light precipitation to the NorCal mountains Sunday evening through
the overnight hours. Temperatures will lower slightly by Monday,
and we could see a gusty northern wind event behind the trough.
Ridging builds again for the early part of the week with
temperatures remaining around 5 degrees warmer than normal. A
larger upper level trough looks to approach the Pacific northwest
by the end of the extended period, bringing a wetter storm system
into the area beginning Wednesday evening. HEC
Mainly VFR conditions. A brief weather system will
bring scattered -SHRA through tomorrow morning and possible MVFR
conditions to TAF sites after 11Z tomorrow. Winds increasing to
sustained greater than 10-15 kt by 12Z with gusts up to 20-25 kt
by 18Z. HEC