Area Forecast Discussion
Issued by NWS Sacramento, CA
FXUS66 KSTO 221121
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
421 AM PDT Fri Aug 22 2014
A Weak trough over the west coast with northwest flow aloft will
bring dry conditions and daytime temperatures a few degrees below
normal through early next week. High pressure moving inland over
the west coast will bring warming to near or a little above normal
Tuesday through Friday.
Upper Low over the Pacific Northwest and southward into NORCAL
forecast to shift into the northern Great Basin by this afternoon.
Main impact this morning is an increased onshore surface gradient
resulting in a stronger delta breeze. Marine layer is beginning to
increase a bit as well with some patchy stratus moving into the
delta. The increase in onshore flow combined with a slight overall
airmass cooling should bring a few degrees of cooling today most
areas. The higher elevations will see breezy southwest winds as
well. The upper low is forecast to continue eastward on Saturday
with weak troughing lingering over the western U.S. The troughing
and a weak onshore flow will keep daytime temperatures near or
below normal through the weekend. High pressure over the eastern
Pacific begins to push inland on Monday. By Monday
afternoon...airmass begins to warm a bit and onshore surface flow
should begin to weaken resulting in the start of a warming trend.
.Extended Discussion (Tuesday through Friday)
Ridge of high pressure will slide over the western U.S bringing
warmer temperatures into mid-week. Ridge axis over the west coast
will bring the warmest temperatures around Wednesday with daytime
highs coming in just a bit above normal. Ridge weakens towards the
end of next week allowing for a slight cooling especially near the
delta but extended models differ on details. All solutions keep
forecast area dry through the extended period.
NWly flow alf ovr Intr NorCal with VFR conds nxt 24 hrs exc isold
MVFR/IFR conds poss in ST vcnty Delta til arnd 18z Fri. Lcl SWly
sfc wnd gsts to 30 kts poss ovr hyr mtn trrn and thru Delta this
aftn into eve.