Area Forecast Discussion
Issued by NWS Sacramento, CA
FXUS66 KSTO 300958
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
258 AM PDT SUN AUG 30 2015
Dry with mostly below normal temperatures this week.
A broad upper trough remains over Northern California. Drier air
has settled across the region, with clear skies now prevailing
over the interior. A modest onshore breeze continues to blow
through the Delta. Temperatures across the forecast area are
running 5 to 10 degrees cooler than yesterday morning.
A shortwave is approaching the NW California coast, though it`s
quite a bit weaker than yesterday`s frontal system. Precipitation
is expected to remain outside of our forecast area. Temperatures
this afternoon are expected to reach the mid to upper 80s across
the Valley today, with 60s to lower 80s over the mountains. These
forecast highs are a few degrees cooler than normal.
Temperatures should warm slightly on Monday as high pressure
tries to build into California from the south. Another series of
shortwave troughs Tuesday and Wednesday will quickly knock
temperatures back below normal across the forecast area.
.EXTENDED DISCUSSION (Thursday THROUGH Sunday)
NorCal will remain under the influence of a large scale trough
pattern through the end of the week. This will likely keep temps
below average. The GFS and EC continues to hint at a deeper
trough trough Thursday bringing precipitation to far northern CA
near the OR border, but the model consensus leaves things dry
The trough is forecast to lift out to the northeast over the
weekend allowing short-wave ridging to rebuild across NorCal. This
may allow temps to climb back above average with the warmest
Valley readings returning to the mid 90s.
VFR conds cont. Generally light winds with gusts 15-25 mph
through the Carquinez Strait and W Delta.