Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
229 PM EST Sun Dec 14 2025

Valid 00Z Mon Dec 15 2025 - 00Z Wed Dec 17 2025

...Heavy snow over parts of the Lakes Erie/Ontario coastline...

...There is a Slight Risk of excessive rainfall over parts of the Pacific
Northwest on Monday...

...Cold temperatures over the eastern third of the country on Monday...

The high pressure will bring temperatures 10 to 15 degrees below average
over the Eastern third of the country on Monday. Upper-level energy will
produce light to moderate snow over parts of Michigan, tapering off by
Monday evening. See the WPC Heavy Snow Discussion for details and amounts.
Additionally, lake-effect/lake-enhanced snow will develop downwind from
the Great Lakes through late Monday afternoon.

Meanwhile, onshore flow over the Pacific Northwest will produce rain on
Sunday and heavy rain Monday into Tuesday. Therefore, the WPC has issued a
Slight Risk (level 2/4) of excessive rainfall over the Pacific Northwest
from Monday into Tuesday morning. The associated heavy rain will create
mainly localized areas of flash flooding, with urban areas, roads, small
streams, and burn scars being the most vulnerable. The rain will continue
over the Northwest through Tuesday evening. After the associated front
moves over the area on Monday afternoon into Tuesday, moderate to heavy
snow will develop over parts of the Cascades into the Northern Rockies.

Ziegenfelder

Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php