Area Forecast Discussion
Issued by NWS Sacramento, CA
FXUS66 KSTO 072248
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
248 PM PST Sat Dec 7 2013
A cold low pressure system has exited the region and scattered
light showers/snow flurries will taper off this evening mainly
over the Sierra Nevada. A very cold airmass will settle into
Northern California today, bringing overnight hard freeze
conditions each night through at least the middle of next week.
Low confidence in a weather system late next week.
Weather system continues to push move away from out region but in
its wake scattered light showers and flurries will persist
into the evening before ending over the western slopes.
The main focus moving forward will be on the freezing
temperatures at night. Cold Air will continue to funnel south from
Canada the next couple of days and a ridge of high pressure will
remain over the region throughout most of next week and hard
freezes expected through Wednesday and may take until Friday
before temperatures warm enough at night to drop any concern of a
hard freeze. Some locations could get record or be nearing record
lows the next couple of mornings. The coldest locations will
likely be reaching the freezing mark by 8 pm with all other
locations reaching the freezing mark by midnight. 12 plus hours of
freezing temperatures are expected for the coldest locations.
Temperatures will warm above freezing each morning between 9 and
Other than the cold, patches of dense fog formed this morning in
the central valley and there is a chance that it will form again
Sunday morning except it would be freezing fog. It will be
something we will have to monitor throughout the night.
Some Record lows for Dec 8th Sacramento 27/2009, Sac Exec 23/2009,
Stockton 22/1978, Modesto 25/2009, Redding 20/1972,
Red Bluff 19/2009.
Some Record lows for Dec 9th Sacramento 23/1932, Sac Exec 21/1972,
Stockton 23/1972, Modesto 22/1972, Redding 21/1972,
Red Bluff 20/2009.
.Extended Discussion (Wednesday through Saturday)
Models continue to show little run to run consistency with
handling of waves moving into the EPAC ridge during the extended
period. One trough may impact the region late Thursday into
Friday, but models diverge significantly at that point so not much
certainty in what will happen. Have trended the forecast towards
model consensus and climatological chances of precip given the
uncertainty, which for this team of year equates to near normal
temperatures and a chance of rain just about everywhere in our
forecast area. -DVC
Lingering showers across foothills and higher elevations generally
around Interstate 80 and southward. Expect oscillating VFR/MVFR/IFR
cigs/vsbys for the western Sierra slopes south of I-80 this
evening. The central valley has cleared out and all TAF sites are
currently VFR and should remain so for most of the evening.
However, colder air tonight with lingering moisture in the air
could allow patchy fog and intermittent low stratus to develop
overnight into Sunday morning, primarily in portions of the
southern Sacramento & northern San Joaquin valleys. JBB