FXUS66 KSTO 112031
AFDSTO
Area Forecast Discussion
National Weather Service Sacramento CA
131 PM PDT Sat Oct 11 2025
SYNOPSIS...
Dry weather with breezy north to west winds this weekend ahead of
a wet, cold system bringing widespread rainfall and the season`s
first measurable snowfall to the mountains, though exact amounts
and timing are still uncertain.
.KEY MESSAGES...
* TODAY - SUNDAY:
- Briefly drier conditions into Sunday before the next system
arrives early next week with breezy north to west winds up to
15-25 MPH this afternoon then again late early Sunday morning.
* 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. Moderate travel impacts are expected south of HWY 50 and
above 6500 feet with travel delays and slippery conditions
expected over much of the Sierra.
- Rain for the Valley/foothills is expected to begin Monday
morning with heaviest rainfall rate later that afternoon and
evening before transitioning to lighter, scattered showers on
Tuesday.
- 10-20% chance of thunderstorms Monday evening into Tuesday
morning as well, as the system begins to move onshore.
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