Area Forecast Discussion
Issued by NWS Sacramento, CA
FXUS66 KSTO 041729
Area Forecast Discussion
National Weather Service Sacramento CA
929 AM PST Sun Dec 4 2016
A small upper level disturbance will bring chances for small
amounts of rain and snow to the valley and mountains Sunday into
Tuesday. Colder air in the Valley could result in near to below
freezing overnight temperatures Tuesday and Wednesday mornings. A
stronger system will move into the region Wednesday night into
Thursday and will bring wind, rain, and snow through Friday.
High clouds are drifting across the region today ahead of a weak
system that will move through the north late this afternoon and
tonight. A second system will move through the region Monday night
and Tuesday. This system now looks like it may bring light
amounts of precipitation to a greater part of the region.
Precipitation amounts with both systems look to be very light
and no significant problems are expected.
Temperatures at night will be getting colder with overnight low
temperatures Monday night and Tuesday morning looking like
temperatures will be mid 30s for the Valley with some of the
coldest spots dipping into the lower 30s. The coldest morning
still looks to be on Wednesday. At this time widespread morning
lows around freezing with some of the colder spots dipping into
the upper 20s looks likely. There may be high clouds drifting
over the region along with some north wind in spots that may help
to mitigate the temperatures some form current forecast so we
will have to monitor that.
The cold morning lows will be short lived as a stronger more
significant system moves into the region Wednesday night into
.EXTENDED DISCUSSION (Thursday THROUGH Sunday)
Precipitation chances expected to increase across the region
Thursday and Friday as upper ridge shifts east allowing an upper
trough to move through. Models show potential for some significant
QPF for NorCal as system interacts with moisture moving across
the Pacific. weak ridging next weekend may allow for drier weather
for a few days.
Cool temperatures expected Thursday as cold air remains trapped
across NorCal from earlier in the week, but increased mixing
expected to bring moderating temperatures by next weekend.
Light and variable flow expected to continue at the surface for
the next 24 hours as weakening frontal system moves south into
NorCal after 00Z Monday. Areas of MVFR thru about 22Z, otherwise
VFR next 24 hours.