FXUS66 KSTO 122200
AFDSTO
Area Forecast Discussion
National Weather Service Sacramento CA
300 PM PDT Sun Oct 12 2025
SYNOPSIS...
Dry weather with breezy north to west winds ahead of a wet, cold
system bringing widespread rainfall and the season`s first
measurable snowfall to the mountains Monday and Tuesday.
.KEY MESSAGES...
* TODAY:
- Dry conditions with breezy north to west winds up to 15-20 MPH,
shifting to west across the Delta and south of I-80 late this
afternoon and evening.
* MONDAY - WEDNESDAY:
- A colder, wet system arrives early next week, bringing
widespread rainfall and the season`s first measurable mountain
snowfall through Wednesday evening.
- Winter Storm Warnings are in effect from 5 AM Monday to 5 AM
Wednesday for the Sierra Nevada and Lassen NP areas above 6500
feet for 1-2 feet of snow, up to 3 along the highest peaks and
gusts up to 30-35 MPH. Heaviest snow accumulation will be
Monday afternoon and evening with highest totals south of Hwy.
50.
- Rain for the Valley/foothills is expected to begin Monday
morning with heaviest rainfall rate later in afternoon and
evening before transitioning to lighter, scattered showers on
Tuesday. Valley amounts are forecasted around 0.75-1.25" in the
Valley with higher amounts along the Motherlode and eastern
portions of the Valley.
- 10-20% chance of thunderstorms Monday evening into Tuesday
morning as well, as the system begins to move onshore.
- Dry conditions develop after Wednesday with breezy north winds.
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