610
FXUS66 KSTO 032043
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1243 PM PST Wed Dec 3 2025



.KEY MESSAGES...

 - Periods of clouds, mist, or fog continue in the Central Valley
   for the next few mornings mainly from the Sacramento area
   southward to northern San Juaquin valley.

-  Normal tempareatures for the next 7 days with highs in the
   valley in the upper 50s to mid 60s north and lows in the 40s.

 - Weak system brushes by the area this weekend, bringing a slight chance
   for showers across Shasta County. Dry weather continues
   elsewhere for the foreseeable future.

&&

.DISCUSSION...

...Tonight...
The inside slider system which brought dry northerly flow to the
area will move off to the south and east. As it does northerly
flow will decreast for less winds tonight but overnight humidity
recoveries will be low in the 30 to 40 percent range in the
foothills and mountains. In the valley...with less winds
inversions should set up again for some fog from Sacramento
southward. Probably not widespread or dense enough for a fog
advisory.

A stronger system will move into the PacNW on Saturday which will
bring a slight chance of a few showers to Shasta county with
little to no impact...otherwise the weather will be dry.

Sunday through next Wednesday including the extended period the
upper pattern changes very little as riding over CA or to the west
remains inplace. This will result in continued dry weather with
occasionally morning fog in the valley. Fog and low clouds should
be able to burn off by mid morning most days so high temperatures
will actually be pretty close to normal for this time of the year
in the 50s to around 60 with lows in the 40s.

Alomst all ensembles are in agreement in this dry pattern. Some AI
models have been hinting at to return to westerly flow by mid
December but that is a ways out there and will see how that pans
out. WR
&&


.AVIATION...


Decreasing north to east winds with gusts up to 20-30 kts becoming
light in the Valley by 09z Thursday and lingering mountain gusts
of 10-20 kts into 12z Thursday as light north to east winds
continue into 18z Thursday. Weaker northerly flow compared to
this morning (Wednesday) brings the chances for another round of
patchy BR/FG across the central Valley with best chances across
the Southern Sacramento Valley southward around 50-75% from
12z-18z Thursday.

&&

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

$$