568
FXUS66 KSTO 080816 CCA
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
115 AM PDT Sun Sep 8 2024

.Synopsis...
Not quite as hot early this week, then cooler by mid-week with the
potential for showers Wednesday into Thursday. Breezy at times.

&&

.Discussion...
Skies have cleared out across the region as the weak low moves
slowly east along the Oregon/California border. Surface pressure
gradients remain weak and the marine layer is shallow (still
around 1k ft or less in depth). Current temperatures are running
about 5-10 degrees cooler compared to 24 hours ago from the
Sacramento area northward, and are showing little change
elsewhere.

Not much change is forecast through Monday as the low lifts out to
the east, but stronger high pressure remains displaced to our
south and east. Warmest portions of the Central Valley will
continue to see highs around the century mark and HeatRisk will
stay in the Moderate category.

Still some uncertainty with the trough moving in around the middle
of the week, though a majority of clusters (around 60%) are now
leaning toward a stronger short-wave brushing across NorCal
Wednesday afternoon and evening bringing the potential for showers
to mainly the northern mountains and northern Sierra. Ahead of the
approaching trough, stronger onshore flow is forecast to develop
on Tuesday leading to the beginning of more significant cooling.

&&

.EXTENDED DISCUSSION (Thursday THROUGH Sunday)...
Below normal high temperatures continue Thursday as deep upper low
pushes into the Intermountain West. Locally gusty northerly winds
expected Thursday into Friday. AMS warms slightly Friday as weak
upper ridging builds inland. Highs Friday expected around 90 in the
Central Valley. Synoptic cooling returns next weekend as another
upper low/trough digs along the West Coast. Low centered near KUKI
by 00z Mon brings a potential for some showers in the Coastal Range
and northern mountains. Highs Sunday expected in the low to mid 80s
for the Central Valley with 50s to 70s for the mountains and
foothills.


&&

.AVIATION...
VFR conditions over interior NorCal next 24 hrs with sfc wind
mainly below 12 kts.

&&

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

&&

$$