Area Forecast Discussion


604 
FXUS66 KSTO 162255
AFDSTO
Area Forecast Discussion
National Weather Service Sacramento CA
255 PM PST Sat Dec 16 2017
.Synopsis...
Windy dry conditions today into tonight with wind advisories and 
Red Flag warnings in place. Decreasing winds Sunday. A chance of 
light rain or showers mainly over the mountains mid week. 
Otherwise dry conditions through the end of next week. 
&&
.Discussion... 
Strong winds will continue through the afternoon. The winds will
gradually decrease this evening with a chance they may stay up
stronger for an hour or so longer over parts of the west side of
the Sacramento Valley and down into the Northern San Joaquin 
Valley. Breezy conditions are expected overnight along the west
side of the valley. Gusty northeast to east winds will continue
overnight over portions of the western slopes with the favored
canyon/ridges getting gusts up around 45 mph or higher.
Northerly winds will be lighter on Sunday as the high pressure
ridge builds over the region and surface pressure gradients 
lighten up.
A weak system will move through the region Tuesday night and
Wednesday and may be able to bring several inches of snow to the
mountains with minimal amounts of rain to the valley. Colder air
moving over the region may keep daytime highs in the 50s for the
valley to the 30s for the mountains on Wednesday.
&&
.EXTENDED DISCUSSION (Wednesday THROUGH Saturday)
Confidence is improving that a cold upper trough from the Gulf of
Alaska will move through the region on Wednesday bringing the 
potential for showers, mainly for the foothills and mountains. 
Precipitation is expected to be minimal. Gusty north winds will 
likely develop through the Central Valley in its wake later next 
week.
&&
.AVIATION...
VFR conditions next 24 hours. Storng northerly winds in the 
Central Valley 20-30 kts with gusts 30-40 kts through 2z Sunday,
decreasing to 10-20 kts gusts up to 25 kts through 6z Sunday.
&&
.STO WATCHES/WARNINGS/ADVISORIES...
Red Flag Warning until 10 AM PST Sunday for Carquinez Strait and 
Delta-Central Sacramento Valley in Glenn, Colusa, Yuba, Northern 
Sutter, and Butte County Below 1000 Ft-Eastern Mendocino NF-Lake 
County Portion of Lake-Napa-Sonoma Unit-Northern San Joaquin 
Valley in San Joaquin and Stanislaus Counties Below 1000 ft-
Southeast Edge Shasta-Trinity NF and Western Portions of Tehama-
Glenn Unit-Southern Sacramento Valley in Yolo-Sacramento Far 
Western Placer, southern Sutter and Solano County Below 1000 Ft.
Wind Advisory until 6 PM PST this evening for Carquinez Strait 
and Delta-Central Sacramento Valley-Clear Lake/Southern Lake 
County-Mountains Southwestern Shasta County to Northern Lake 
County-Northern Sacramento Valley-Northern San Joaquin Valley-
Southern Sacramento Valley.
&&
$$