Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
259 PM EST Thu Dec 28 2023

Valid 00Z Fri Dec 29 2023 - 00Z Sun Dec 31 2023

...Snow over parts of the Middle Mississippi/Ohio Valleys moving into the
Northern/Central Appalachians and Northeast...

...Rain/freezing rain over parts of northern Maine...

...There is a Marginal Risk of excessive rainfall over parts of Northern
California...

An upper-level low over parts of the Middle Mississippi and Ohio Valleys
slowly weakens and moves to the Gulf of Maine by Saturday evening. The
system will produce light snow over parts of the Middle Mississippi/Ohio
Valleys, with rain extending eastward to the Northeast from parts of the
Great Lakes. Overnight Thursday into Friday afternoon, an area of
rain/freezing rain will develop over parts of Northern Maine.

On Friday, the rain continues over parts of the Great Lakes into the
Northeast as light snow migrates across the Ohio Valley. During the late
afternoon, rain will change over to snow over northern Maine. Snow will
develop over the Northern/Central Appalachians from Friday evening into
Saturday. By Saturday, the light snow will continue over parts of the
Northern/Central Appalachians.

Meanwhile, a front over the Eastern Pacific moves onshore over the West
Coast by Friday and dissipates by Saturday. Ahead of the front, moisture
from the Pacific will move onshore, creating light rain over parts of the
Pacific Northwest and Northern California. A plume of moisture will stream
into Northern California from Friday into Saturday, producing moderate to
heavy rain. Therefore, the WPC has issued a Marginal Risk of excessive
rainfall over parts of Northern California from Friday through Saturday
morning. The associated heavy rain will create localized areas of flash
flooding, affecting areas that experience rapid runoff with heavy rain.

Overnight Friday, the snow levels will lower over the Sierra Nevada
Mountains as snow develops over the higher elevations on Saturday into
Saturday evening. In addition, rain will continue over the Northwest into
Southern California.


Ziegenfelder


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