Excessive Rainfall Discussion
NWS Weather Prediction Center College Park MD
320 AM EST Sun Dec 21 2025
Day 2
Valid 12Z Mon Dec 22 2025 - 12Z Tue Dec 23 2025

...THERE IS A MODERATE RISK FOR EXCESSIVE RAINFALL IN EFFECT FOR
PORTIONS OF THE SIERRA NEVADA IN NORTHERN CALIFORNIA...

The atmospheric river will move southward during this period as
will the heavy rainfall footprint spread further down the Sierra
Nevada Range and along the coastline. Much of the same area of the
Sierra Nevada is projected to receive additional 2-3 inches over
the water logged area from Day 1. A Moderate Risk was maintained
along with expanding a touch to the south. Multi-day accumulations
will likely be well into the double digits by this time and leading
to several instances of rapid runoff, sloughing and debris flows
along the foothills/adjacent locations.

Campbell


Day 2 threat area: www.wpc.ncep.noaa.gov/qpf/98epoints.txt