Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
304 PM EST Mon Dec 15 2025

Valid 00Z Tue Dec 16 2025 - 00Z Thu Dec 18 2025

...Heavy snow over parts of the Lakes Erie/Ontario coastline on Monday
night into Tuesday...

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

...Heavy snow for the Cascades and Northern Rockies...

The high pressure over the eastern third of the country will slowly move
eastward out over the Atlantic by Wednesday. Upper-level energy over the
Lower Great Lakes will produce light to moderate snow downwind from Lakes
Erie/Ontario from Monday night into Tuesday morning. See the WPC Heavy
Snow Discussion for details and amounts.

Meanwhile, a front over the Pacific Northwest will move eastward to the
Northern Rockies and dissipate by Tuesday evening. Onshore flow over the
Pacific Northwest will produce heavy rain Monday night into Tuesday
morning. Therefore, the WPC has issued a Slight Risk (level 2/4) of
excessive rainfall over the Pacific Northwest through 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. A second front moves over the Northwest overnight
Tuesday, moving to the Northern Plains and Northern/Central Rockies by
Wednesday evening. The rain will continue over the Northwest and Northern
California through Wednesday. After the associated front moves over the
area, moderate to heavy snow will develop across parts of the Cascades and
Northern Rockies through Wednesday evening.

Moreover, as the second front moves onto the Northern Plains, rain will
develop over parts of the Northern Plains on Wednesday afternoon and
evening. Lastly, moisture from the Gulf will start to stream northward
over the Southern Plains, producing scattered showers and thunderstorms
over the Western Gulf Coast overnight Tuesday into Wednesday.


Ziegenfelder


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