Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 212238

338 PM PDT Thu Aug 21 2014

Weak trough over the west coast with northwest flow aloft will
bring dry conditions with a near to a few degrees below normal
temperatures through early next week. High pressure moving inland
over the west coast will bring warming to near or a little above
normal Tuesday into Thursday.


High pressure over the Eastern Pacific and a trough over the
Pacific Northwest with Northern California in between them with
Northwest flow aloft today. Low clouds dissipated in the Delta
region by 11 am this morning but may return again tomorrow
morning west of Cordelia. Warmer temperatures this afternoon due
to higher pressure nudging into the area along with weaker
onshore flow and a more shallow marine layer (down to around 1500
ft this afternoon). The Delta region is seeing the biggest warm up
(about 12 degrees) compared to yesterday afternoon with weaker
winds (25005 kt versus 24023 kt). The upper level trough digs down
into far northern California tomorrow bringing a little cooler
temperatures especially across the north and locally breezy
westerly winds over the ridgetops. Temperatures are expected to be
in the mid 80s to low 90s in the Valley and 60s and 70s in the
mountain tomorrow afternoon which is a few degrees below normal
for this time of year. Temperatures will be similar to a little
warmer on Saturday and be about the same on Sunday as Northern
California lies between ridge of High pressure over the Eastern
Pacific and a trough over the Western U.S. Temperatures are
expected to be in the mid 80s to mid 90s in the Valley and low 60s
to low 80s in the mountains which is near to several degrees below
normal for this time of year.

.Extended Discussion (Monday through Thursday)

Ridge of high pressure over the Eastern Pacific builds into
Northern California bringing warmer temperatures into mid-week.
Although the ECMWF is showing a cut off low off of the Northern
California Coast possibly Wednesday and moving inland Thursday
which would increase onshore flow bringing some cooling,
especially to the delta and adjacent valley areas.



Northwest flow aloft over interior NorCal with VFR conditions the
next 24 hours. Southerly wind gusts up to 20 kts through 03Z for
KRDD and KRBL. Local MVFR from stratus/fog in west delta after


.STO Watches/Warnings/Advisories...

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