Area Forecast Discussion
Issued by NWS Sacramento, CA
FXUS66 KSTO 290533
Area Forecast Discussion
National Weather Service Sacramento CA
930 PM PST SAT NOV 28 2015
Near to below freezing morning temperatures Sunday. The next
storm will arrive Thursday bringing cold, wet, and windy weather
to our region.
.SHORT TERM DISCUSSION (TODAY THROUGH TUESDAY)...
Temps as of 8-9 pm were already in the 30s in the Valley as much
as 10-16 degrees colder than last nite at some locations. A dry
air mass (dewpoints in the teens and 20s)...clear skies and light
winds will allow for strong radiational cooling and freezing temps
Main short wave energy offshore will be rotating underneath the Rex
Block over the Great Basin tonite and Sun and finally ejecting the
block Ewd where it will weaken its influence over Norcal on Sun...
allowing ridging to rebuild along the W Coast. Much lighter winds...
and clear skies on Sun make it conducive for precipitous drops in
temps below freezing Sun morning...then warming into the 50s in the
Valley during the afternoon.
A trof currently along 140W will weaken as it encounters the W Coast
ridge leaving only the coastal range with a chance of showers over
our CWA on Mon. A positively-tilted upper ridge will rebuild from CA
into the Nrn Rockys on Tue allowing for a moderation in temps...
after a chilly start to the morning. JHM
.EXTENDED DISCUSSION (Wednesday THROUGH Saturday)
Unsettled weather is expected for much of the extended period. A
weak wave will move through the region Wednesday, possibly
spreading light precipitation mainly across the northern portions
of our forecast area.
A stronger system will likely impact Northern California Thursday
next week, with the GFS, European, and Canadian models in fairly
good agreement. This system will likely bring a quick shot of
moderate rain and mid-elevation mountain snow. This system looks
to be a fair bit breezier than the last few storm systems, which
when combined with rain could bring power outages. Additionally,
recently fallen leaves could bring localized flooding with clogged
drains and gutters.
Drier weather looks to set in Friday into next Saturday. There are
some hints of another system late next weekend, but confidence is
low at this time.
VFR conditions with generally light winds the next 24 hours.
Freeze Warning from 1 AM to 9 AM PST Sunday for Carquinez Strait
and Delta-Central Sacramento Valley-Northern Sacramento Valley-
Northern San Joaquin Valley-Southern Sacramento Valley.