Excessive Rainfall Discussion
NWS Weather Prediction Center College Park MD
320 AM EST Sun Dec 21 2025
Day 3
Valid 12Z Tue Dec 23 2025 - 12Z Wed Dec 24 2025

...THERE IS A SLIGHT RISK FOR EXCESSIVE RAINFALL IN EFFECT FOR
PORTIONS OF THE SIERRA NEVADA IN NORTHERN CALIFORNIA, ALONG THE
COASTLINE OF CENTRAL CALIFORNIA AND FOR SOUTHERN CALIFORNIA....

Another reinforcing surge of Pacific moisture will be moving
onshore northern California while the southward moving impulse will
lead to a rapid uptick in rainfall in southern California. The
latest guidance is depicting another 1 to 4 inches for northern and
central California and 2 to 4+ for the higher terrain of southern
California. A Slight Risk covers much of the coastline from central
to northern California and into the northern part of the Sierra
Nevada. Additionally, another Slight Risk is in place for the
favored terrain of southern California.

Campbell

Day 3 threat area: www.wpc.ncep.noaa.gov/qpf/99epoints.txt