Arnold, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

229
FXUS66 KSTO 122031
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1231 PM PST Mon Jan 12 2026

.KEY MESSAGES...

 - Dry weather expected next 7 days with a return to widespread
   Valley fog/low clouds and warm/dry weather at higher
   elevations.

&&

.DISCUSSION...

...Today...

Dry and mostly sunny conditions and seasonable temperatures
expected throughout interior NorCal today as things continue to
clear through the late morning into the afternoon. Valley fog
development is expected overnight and into Tuesday morning,
although some uncertainty regarding areal coverage remains.
Resultant HIRES guidance continues to show a 40 to 70 percent
chance of visibility reductions below a half mile across the
Delta, central/southern Sacramento Valley, and northern San
Joaquin Valley, highest over the northern San Joaquin Valley
areas.

...The Week Ahead...

A stationary ridge continues to amplify across the West Coast
into this week bringing potential for persistent low stratus and
fog to the Valley. Areas above the stratus (upper foothills and
mountains) will see above normal temperatures and dry conditions
with cooler temperatures below as long as the stratus holds in
place in the Valley. Low daytime humidity and limited overnight
recovery will be likely in higher elevation areas where fog and
low clouds remain nonexistent as well. Overall light winds are
expected elsewhere throughout the week although a period of
breezier north winds is possible late in the week with a 40 to 70
percent chance of gusts up to 25 mph across the northern half of
Shasta County from Wednesday to Friday. Depending on the extent
of these breezier Valley winds, persistent fog and low stratus may
be inhibited later in the week.

&&

.AVIATION...

VFR conditions continue through around 06z Tuesday at TAF sites
as dry weather and light winds prevail. MVFR/IFR/LIFR conditions
in BR/FG then expected to return after 06z at SCK, MOD, and
Sacramento sites, with some potential for lingering MVFR/IFR cigs
as BR/FG dissipates Tuesday morning. Breezy to gusty downslope
winds anticipated over the Sierra after 00z Tuesday.

&&

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

$$