676
FXUS66 KSTO 102019
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1219 PM PST Sat Jan 10 2026

For additional details on weather and expected impacts over the
next 7 days, please visit weather.gov/sto/briefing.


.KEY MESSAGES...

 - Dry weather expected next 7 days with areas of patchy morning
   fog and cold overnight/morning temperatures through Sunday.

 - Increasing potential for a return to more widespread Valley
   fog/low clouds and warm/dry weather at higher elevations into
   next week.

&&

.DISCUSSION...

...Today and Sunday...

Current satellite and radar has dry conditions and high level
clouds moving through Northern California this afternoon and
evening. Temperatures are in the 50s in the Valley and 30s in the
mountains. Seasonal temperatures persist throughout today and
into tomorrow, with light north winds. Valley fog development is
expected overnight and into tomorrow morning, with visibility
reductions. How widespread and dense it becomes remains unclear
with HIRES guidance showing a 40 to 50 percent chance of
visibility reductions below a half mile. None the less, fog is
likely overnight and into Sunday morning but at this time
confidence is low on it becoming widespread. Most likely scenario
is patchy dense fog with visibility reductions to a half mile or
less.

Fog lingers through Sunday morning, with northerly light winds
helping to push it out by the late morning and afternoon. Morning lows
and overnight temperatures Sunday, will drop into the 30s. Expect
dry conditions throughout Sunday, with further fog potential in
the overnight hours Sunday into Monday.

...Next Week...

A stationary ridge continues to amplify across the West Coast
through next week bringing low stratus and fog to the Valley.
Areas above the stratus (the foothills) will see above normal
temperatures and dry conditions. There remains some uncertainty
on how strong winds will be next week, but its likely we remain
light and variable in the Valley and have breezy terrain driven
winds in the mountains. There exists a 20 percent chance that
northerly winds remain stronger for portions of the northern
Valley early next week. This would yield less fog and low stratus
for those areas. Confidence in the low stratus and fog dwindle by
the end of the week and into next weekend as confidence is
increasing for breezier northerly winds. This would limit the
stratus end of the week and into the weekend bringing more
sunshine and warmth to the Valley. During this time, areas above
the stratus (foothills) will have warmer than average
temperatures and drier conditions, with RH values dropping
potentially into the teens with little overnight recovery.

&&


.AVIATION...

VFR conditions and light winds expected to prevail at RDD/RBL
through the forecast period. Similar conditions persist at
remaining TAF sites through 06z Sunday, with increasing potential
for MVFR/IFR conditions in areas of BR/FG after 06z. Downsloping
east-northeast winds gusting to 20 kts expected overnight along
the Sierra.

&&

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

$$