079
FXUS66 KSTO 102022
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
122 PM PDT Fri Oct 10 2025

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

.SYNOPSIS...
A weak system continues bringing scattered showers and
thunderstorms this afternoon and evening north of I-80. A colder,
wet system will then bring widespread rainfall and the season`s
first measurable snowfall to the mountains, though exact amounts
and timing are still uncertain.

.KEY MESSAGES...

* TODAY - SUNDAY:

 - A weak system continues to bring breezy winds and scattered
   showers today, with precip primarily in Shasta County and the
   southern Cascades. Potential for rain continues through
   Saturday afternoon with a 55 to 80% chance of 0.25 inches in
   the aforementioned areas through Saturday.

 - 10-20% chance for thunderstorms this afternoon/evening in
   Shasta County.

 - Briefly drier conditions on Sunday before the next system
   arrives early next week.

* MONDAY - WEDNESDAY:

 - A colder, wet system arrives early next week, bringing
   widespread rainfall and the season`s first measurable mountain
   snowfall through Wednesday evening.

 - Exact timing and amounts are still uncertain for this system,
   but a Winter Storm Watch has been issued from Monday morning to
   Wednesday evening for the Sierra south of I-80 and above 6500
   ft. Biggest impacts are expected south of HWY 50.

 - 10-20% chance of thunderstorms Monday evening into Tuesday
   morning as well, as the system begins to move onshore.

.AVIATION...
A weak system will bring isolated MVFR conditions due to
scattered showers north of I-80 and a 10-20% chance of isolated
thunderstorms over Shasta County and adjacent terrain between 21Z
Friday and 02Z Saturday. South winds 10-15 kts with gusts 15 to 20
kts through the Delta and northern/central Sacramento Valley
until 04Z Saturday. Southwest gusts up to 20-30 kts over the
mountains through 23Z Saturday.

&&

.STO WATCHES/WARNINGS/ADVISORIES...
Winter Storm Watch from Monday morning through Wednesday
evening for West Slope Northern Sierra Nevada.

&&

$$