Area Forecast Discussion
Issued by NWS Sacramento, CA
FXUS66 KSTO 051053
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
353 AM PDT MON OCT 5 2015
Mild weather with near to slightly below temperatures through
Tuesday. Warming begins Wednesday.
Cyclonic flow from the upper low over SoCal will be affecting
NorCal for at least one more day before the transition to
anticyclonic flow with the return of high pressure from the
eastern Pacific on Tuesday. Backwash cloudiness around the low
will bank-up clouds to the east of the Sierra Nevada Crest today,
and some will spill-over into the far southeast portion of the
forecast area. There`ll be just a slight chance of a shower or
thunderstorm across Alpine and Tuolumne Counties this afternoon.
Elsewhere, just some high clouds will pass by today.
Otherwise, dry weather pattern develops with ridging/warming for
the week ahead.
.Extended Discussion (Friday through Monday)...
Strong upper ridge gradually weakens Friday into the weekend as
several short wave troughs moves through the PacNW. As a result,
temperatures forecast to trend down slightly through Sunday, but
still remain about 3 to 5 degrees above normal. Models vary with
timing of waves, with GFS keeping lower heights over NorCal
Monday, while the EC is rebuilding ridge. Given quasi-zonal flow
around 40N and recent better performance by the EC, forecast leans
towards this solution with slight warming expected Monday. Dry
weather continues through the extended forecast period.
NEly flow alf with lrg upr low ovr SoCal. VFR conds ovr Intr
NorCal nxt 24 hrs exc isold MVFR poss in aftn shwrs/tstms ovr
hyr Siernev S of Hwy 50 btwn 22z-02z.