758
AGUS76 KRSA 102030
HMDRSA

Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
130 PM PST Mon Nov 10 2025

...DRY AND WARM WEATHER TO START FORECAST PERIOD UNDER RIDGING...
...UNSETTLED AND WET WEATHER TO RETURN TO THE REGION ON WEDNESDAY AS
UPPER LEVEL TROUGH AND ATMOSPHERIC RIVER MOVE ONSHORE...

.METEOROLOGICAL CONDITIONS (MON PM - SUN AM)...

Afternoon forecasts continued to follow guidance from the NBM and
WPC in association with the atmospheric river that is forecast to
spread precipitation across the forecast region beginning Wednesday.
Largest guidance changes were seen within the GFS, increasing
accumulations over the North Coast, falling more in line with our
morning forecasts.

Afternoon forecasts increased accumulations over the North Bay,
Southern Sierra, LA Basin, Mt. Shasta, and San Diego Mountains by up
to a quarter inch. Slight decreases (few tenths of an inch) were
made along the Big Sur coast.

The southerly flow of this system will likely favor enhanced upslope
moisture flux along south facing peaks, such as Cape Mendocino, Mt.
Shasta, and the Transverse Range in southern California which may
see increases in accumulations as new guidance comes in.

Freezing levels are forecast to start the period over 13k feet under
the ridge before dropping to below 5k feet across the north and 7k
feet across the south under the digging trough and behind the cold
front on Thursday and into Friday.

QPF graphics are available at www.cnrfc.noaa.gov/qpf.php



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