Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
233 AM EST Sat Dec 20 2025
Valid 12Z Sat Dec 20 2025 - 12Z Mon Dec 22 2025
ĀThere is a Moderate Risk of excessive rainfall over parts of Northern
California on Sunday...
...Heavy snow over parts of the Upper Peninsula of Michigan...
...Heavy snow for the Cascades and Northern Rockies...
A front extending from the Upper Great Lakes to the Central Plain will
move eastward off the East Coast by Sunday evening. On Saturday, the
system will produce heavy snow over parts of the UP of Michigan and light
to moderate snow over the Lower Great Lakes/Northeast on Sunday. See the
WPC Heavy Snow Discussion for details and amounts.
Meanwhile, moisture from the Gulf will stream northward over the Lower
Mississippi Valley, intersecting the boundary there, producing rain over
the area from early Sunday into Monday. In addition, moisture from the
Pacific will stream into Northern California, producing light rain on
Saturday, increasing to heavy rain on Sunday. Therefore, the WPC has
issued a Moderate Risk (level 3/4) of excessive rainfall over parts of
Northern California on Sunday into Monday morning. Numerous flash flooding
events are possible. In addition, many streams may flood, potentially
affecting larger rivers. The flooding may include debris flows in or near
recently burned areas. Moreover, rain and highest-elevation snow will
develop over parts of the Great Basin, the Central Rockies, the Pacific
Northwest, and the Northern Intermountain Region through Monday.
Ziegenfelder
Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php
weather.gov 
