Duarte, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

119
FXUS66 KSTO 232052
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1252 PM PST Fri Jan 23 2026


.KEY MESSAGES...

 - Valley low clouds/fog potential through Saturday morning.

 - Fog potential diminishes Saturday-Sunday as north to northeast
   winds increase tonight into Saturday. Strongest gusts over the
   mountains.

 - Dry weather prevails this weekend, followed by renewed fog
   potential early next week.

&&

.DISCUSSION...

...Today Through Sunday...

Current GOES-West satellite imagery shows diminishing fog and low
clouds across the Valley this afternoon as an upper low continues
it`s path across southern California. The Dense Fog Advisory has
been allowed to expire at 1 PM, although patchy areas of fog
still persist across the Valley. Fog chances return tonight into
tomorrow morning. Probabilities for visibilities 0.5 mile or less
are 40 to 60% from the southern Sacramento Valley and southward,
with the highest probabilities around the Sacramento metropolitan
area. Remember to use low-beam headlights when driving through
fog, exercise caution, and slow down.

As northerly winds increase this afternoon and into tonight, any
fog present should quickly diminish. Strongest winds are expected
Saturday along the western side of the Sacramento Valley (I-5 and
westward) and in the mountains. Probabilities of gusts in these
areas are 60-80%. Relative humidities will also trend lower over
the weekend with these winds, especially over the mountains,
foothills, and in the northern Sacramento Valley. No precipitation
is expected with this weekend`s system.

...Next Week...

As ridging builds back in early next week the potential for
Valley low clouds/fog returns, though exact chances remain
uncertain for the time being. Otherwise, cool and calm weather is
expected for the start of the week. Mid to late next week a slight
chance for unsettled weather returns as troughing attempts to move
into the area. Ensembles show a range of solutions, though all
of them are limited to minor impacts at most. Some solutions have
dry weather through next week, while others show light rain and a
dusting of high elevation snow. Check in with the forecast
periodically for updates.

&&

.AVIATION...
VFR conditions prevail at RDD and RBL through the forecast period
with lingering MVFR/IFR conditions in BR/FG and low clouds
expected across the Delta, northern San Joaquin Valley, and
remaining Sacramento Valley. VFR conditions on the fringes of the
fog/stratus deck may briefly spread inward after 00z. Widespread
IFR/LIFR in FG/BR then redevelops after 03z-06z Friday with
similar areal extent excluding the northern Sacramento Valley.

Increasing northerly winds gusting 15-25 kts develop after 06z
Saturday across the northern Sacramento Valley and extend
southward after 12z. Stronger east-northeast winds anticipated
along the Sierra after 06z, with gusts 30-40 kts.

&&

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

&&

$$