986
FXUS66 KSTO 082153
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
153 PM PST Mon Dec 8 2025

.KEY MESSAGES...

 - Periods of low clouds, mist, fog and unseasonably cool
   temperatures continue in the Central Valley, Delta and lower
   foothills this week, with some warming by late week

-  Increasingly mild temperatures with sunny skies and dry
   weather are expected over higher terrain this week

&&

.DISCUSSION...

...Today - Sunday... Eastern Pacific high pressure ridging
continues a stagnant pattern across the region, with a strong
inversion keeping fog and low stratus over the Valley and Delta
and into the lower foothills. Patchy fog has primarily been
observed over the northern Sacramento Valley and in the foothills
(1500-2000 feet). Fog in the Valley has diminished this afternoon,
but lingers in the foothills where the low clouds intersect the
terrain. This pattern is expected to continue with low clouds
persisting and some patchy fog reforming in the Valley again
tonight. Winds remain generally light and variable.

This pattern is expected to persist through the week and even into
the weekend as the high pressure ridge continues to build. Dry
weather continues across the region. The exception to this is
periods of mist and sprinkles at times with the low clouds and
fog, which may wet the ground. The low clouds continue to keep
temperatures unseasonably cool in the Valley and Delta, while
higher terrain experiences sunny skies and above normal
temperatures. The building high will bring warming temperatures to
the area, especially over higher terrain. Stratus and fog will
limit this warming for portions of the the Valley and Delta that
remain covered, though, so there may be little change in those
areas this week. The northern Sacramento Valley has the best
potential for seeing some clearing and increasing temperatures.

...Next Week...
A pattern change is projected for early next week, but there
remains quite a bit of uncertainty in the timing and intensity of
this system. Current forecast shows the potential for
precipitation north of I-80, especially for the mountains. The
best chances expected over the mountains of Shasta County, but
little to no impacts are expected at this point. Stay tuned for
forecast updates.

&&


.AVIATION...
Lingering low cigs and mist across the Central Valley continue
into this evening with IFR/LIFR conditions, although some sites
may very briefly see MVFR/VFR visibility around 22-24Z, mainly for
TAF sites north of Sacramento. Another round of BF/FG and low
stratus returns after 03Z with areas of IFR/LIFR ceilings once
again expected to persist through the day. Light and variable
surface winds less than 12kts.

&&

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

$$