Area Forecast Discussion
Issued by NWS Sacramento, CA
FXUS66 KSTO 110504
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
904 PM PST Tue Dec 10 2013
A very cold and dry airmass remains over Northern California
which will continue in overnight hard freeze conditions into
Wednesday morning. Milder temperatures along with some clouds will
be possible Thursday into the end of the week. There is a slight
chance of showers over the Coastal Range and Shasta County
Mountains on Thursday night as a weak system brushes by the area.
Strong high pressure off the coast continues to produce an
amplified ridge along the coast. The pattern will gradually
change over the next day as the high pressure shifts inland
overnight and on Wednesday.
Hard freezes expected again tonight and may take until Friday
before temperatures warm enough at night to drop any concern of a
hard freeze. Temperatures are running a little warmer this evening
than the past few nights. Some high clouds drifting south over the
area may be helping a little but those are expected to clear
overnight. By midnight most valley locations will be around the
freezing mark or within an hour or so of that. The only exception
to that may be Redding which has enough of a north wind this
evening that it is keeping temperatures very mild this evening.
Overnight lows should end up being a couple of degrees warmer than
this morning and should warm above freezing between 8 and 9 am.
Some gradual modification of the lows continue to occur each
night. The thermal belt areas will have lows in the 30s but the
foothill valley locations will continue to cool off into the 20s.
Thursday morning should see most valley locations cooling off at
night into the mid to upper 20s with only the warmer locations
dropping down to around the freezing mark.
A system will approach the region Thursday but it is falling
apart and moving north of the region. It looks like it would
modify the airmass over northern California and warm up the lows
enough to get rid of any hard freeze concerns.
A ridge will build over the region behind that system late Friday
and Saturday to keep the region dry with cool nights and mild
.Extended Discussion (Saturday through Tuesday)
The extended forecast looks quiet with dry northwesterly flow
continuing and unseasonably mild temperatures developing by
Sunday. The area remains under the eastern side of Pacific
ridging with little chance of rain or snow and just some light
northerly winds. The next reasonable possibility of precipitation
doesn`t appear to come until late Wednesday and Thursday of next
week. Of course, that far out confidence is limited. EK
Dry Nly flow alf bcmg NE Wed as epac upr rdg blds inld. VFR conds
ovr Intr Norcal nxt 24 hrs exc isold MVFR/IFR/LIFR conds in
HZ/BR/FG in Srn Sac/Nrn San Joaquin Vlys and favrd mtn vlys btwn
08z-19z Wed. Genly lgt sfc wnds with areas frost ovngt into Wed
hard freeze warning until 8 am pst wednesday carquinez strait
and delta...central sacramento valley...northern sacramento
valley...northern san joaquin valley...southern sacramento
hard freeze warning until 8 am pst wednesday below 2000 feet in
the clear lake/southern lake county...motherlode...northeast