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AGUS76 KRSA 032109
HMDRSA

Hydrometeorological Discussion
National Weather Service / California Nevada RFC / Sacramento CA
130 PM PST Mon Nov 3 2025

...LIGHT PRECIP FAR NRN CA/SRN OR MON/TUES MORNING...
...STRONGER SYSTEM WITH HEAVIER PRECIP EXPECTED LATE TUESDAY INTO
THURS MORNING ACROSS NORTHERN CA...

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

Afternoon forecasts have increased precipitation accumulations over
Cape Mendocino (~1 inch) and the northern Sierra (~.25 to .5
inches)through the next 3 days where onshore integrated moisture
transport may exceed 1000 units on Wednesday morning as the cold
front and moisture plume moves onshore across northern California.
these increases generally follow trends in the NBM which has seen
relatively persistent increases over the past several runs.
Accumulations were lowered slightly (.25 to .4 inches) over the far
North Coast.

Both the GFS and EC continue to disagree on exact
timing, similar to this mornings forecast, with differences in total
accumulatations across the North. The EC is slightly slower in
precipitation onset while slightly higher in overall accumulations,
especially over Cape Mendocino and the Shasta Drainage.

Freezing levels will start the forecast period around 10k feet
across northern CA before dropping to 7k feet on Wednesday as the
trough digs southward over the region. Levels are forecast to rise
to >13k feet later in the forecast period as ridging begins to build
again.


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



CH

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