Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 222152 AAA
AFDSTO

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE SACRAMENTO CA
252 PM PDT Tue Apr 22 2014

.Synopsis...
A quick moving weather system bringing cooler temperatures and showers
this afternoon and early evening...mainly over the mountains.
Milder temperatures are forecast Wednesday and Thursday, then another
weather system will bring a chance of precipitation along with
cooler temperatures later Thursday into Saturday. Thunderstorms
are possible on Friday.

&&

.Discussion...
Upper level trough moving east through Northern California this
afternoon and evening. This is bringing cooler temperatures along with
some cumulus clouds over interior Northern California and isolated
showers over the mountains. Temperatures are about 5 to 15 degrees cooler
this afternoon compared to yesterday with the most cooling in the
mountains and the Northern San Joaquin Valley. Warmer temperatures
tomorrow afternoon and mainly dry on Wednesday with weak ridging over the
area. Slight chance of showers over the coastal range and over
Shasta County.  Temperatures should be in the upper 60s to low 70s
on Wednesday which is near normal for most locations this time of year.

An upper level trough deepens off the west coast on Thursday and
moves inland on Friday. This system will bring gusty southwesterly
winds and a chance of showers by Thursday evening...mainly north
of Interstate 80 and spreading south overnight. Temperatures will
be colder on Friday with highs expected to be in the low to mid
60s in the valley and 30s and 40s in the mountains. Showers and
Isolated thunderstorms are also possible with this system on
Friday. Snow levels are expected to be around 7000 ft Thursday and
drop to around 4500 ft on Friday. Several inches of snow are
possible over the higher peaks of the Sierra.


.Extended Discussion (Saturday through Tuesday)

Models showing decreasing threat of showers on Saturday with a
lingering threat over the mountains and far Northern Sacramento
Valley. Low POPs continue Sunday, again mainly over the mountains,
as a weaker Pacific short wave trough moves through in Northwest
flow aloft. High temperatures over the weekend expected to
continue slightly below normal.

Progs similar in building ridge over Interior NorCal early next
week with dry weather and significant warming. High temperatures
by Tuesday expected in the mid 80s for the Central Valley with 60s
to 70s for the mountains and foothills.


&&

.Aviation...

Upper trough is moving through interior Northern California.
Generally VFR conditions expected the next 24 hours, except local
MVFR/IFR conditions in showers over the mountains through this
afternoon. Local Northwest to Southwest winds 10-15 kt with gusts
to 25 kt will be possible through early this evening, then will
become light overnight.

Dang


&&

.STO Watches/Warnings/Advisories...
None.
&&

$$







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