FXUS66 KSTO 010930
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
230 AM PDT Sun Sep 1 2024

.SYNOPSIS...
Not as hot today and Labor Day, then hot weather with widespread
Moderate HeatRisk returns through the end of the week.

&&

.Discussion...
Skies remain clear and current temperatures are similar to 24
hours ago. IR difference imagery shows that stratus remains pretty
sparse along the NorCal coast, however it is beginning to fill
from the north and surface pressure gradients are slowly beginning
to transition to onshore.

The ridge over the area will weaken today and Labor Day as the
closed low/trough presently near 40N/130W moves into far
northwest California and southern Oregon. Appreciable cooling will
develop in the Central Valley today as onshore flow picks up, and
will spread further inland on Labor Day as synoptic cooling
associated with the trough takes hold. Highs will be near to
slightly below average.

Ridging quickly rebounds beginning Tuesday marking the beginning
of another warming trend. A period of breezy north wind will be
possible Tuesday as the trough shifts east leading to elevated
fire weather concerns in the Sacramento Valley. By Wednesday,
probabilities of exceeding 100 degrees increase to above 70
percent through most of the Central Valley.

&&

.EXTENDED DISCUSSION (Thursday THROUGH Sunday)...
Upper low/trough off the CA coast Thu/Fri is progged to move
inland over the weekend, resulting in a cooling trend. Highs in
the Central Valley Thursday forecast from 100 to 105, cool to near
normal by Sunday into the low to mid 90s. 80s and 90s expected in
the foothills and mountains Thursday, lowering to 70 and 80s next
weekend.

&&

.AVIATION...
VFR conditions over interior NorCal next 24 hrs. In the Central
Valley, areas of Sly sfc wind 15-20 kts btwn 21z-04z otherwise
mainly below 12 kts. Vcnty of Delta, SWly sfc wind 15-25 kts with
lcl gusts up to 35 kts.

&&

.STO WATCHES/WARNINGS/ADVISORIES...None.

&&

$$