Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
231 AM EST Wed Jan 08 2025

Valid 12Z Wed Jan 08 2025 - 12Z Fri Jan 10 2025

...Moderate to heavy lake-effect snow downwind from the Great Lakes on
Wednesday...

...A developing Winter Storm will produce snow and rain/freezing rain,
icing, over parts of the Southern Plains and Lower Mississippi Valley late
Wednesday night into Thursday...

...Light to moderate snow over parts of the Northern Rockies/Northern
Plains and Southern Rockies/Southern High Plains on Wednesday: Light snow
over parts of the Upper Midwest on Thursday...

...There is a Critical Risk of fire weather over parts of Southern
California on Wednesday...

Cold high pressure extending from the Central Plains to western Ontario,
Canada, moves to the Mid-Atlantic by Friday. The cold air and upper-level
energy will aid in producing moderate to heavy lake-effect snow downwind
from the Great Lakes on Wednesday and will begin to taper off on Thursday.
 In addition, moderate to heavy upslope snow will develop over parts of
the Northeast, and light to moderate upslope snow over the Central
Appalachians will develop on Wednesday.

Meanwhile, strong high pressure over parts of the Great Basin on Wednesday
set up Santa Ana winds over Southern California. Therefore, the SPC has
issued a Critical Risk of fire weather over parts of Southern California.
Winds of 20 to 40 mph, with stronger winds in the terrain, low relative
humidity, and dry fuels have contributed to the dangerous conditions.

Moreover, on Wednesday, a deep upper low over Northwestern Mexico will
open and move to the Southern Rockies to the Southern Plains by Friday.
The system will create impactful winter weather on Thursday for portions
of the Southern Plains before intensifying as it expands across the Lower
Mississippi Valley overnight Thursday into Friday. Snowfall totals will be
the greatest, 4 to 8 inches, from portions of North Texas across Arkansas
into the Tennessee Valley. Hazardous driving conditions can be expected
through the swath of winter weather. Additionally, rain/freezing rain will
develop over parts of Central Texas into southern Arkansas and northern
Louisiana. Over this region, scattered ice amounts of 0.10 inches will
fall on Thursday.

Furthermore, additional upper-level energy will move over the Pacific
Northwest/Northern Intermountain Region Wednesday morning and reach the
Southern Rockies and the Upper Great Lakes by Friday. The energy will aid
in the development of a new front over the Northern/Central Plains into
the Central Rockies that will move eastward to the Upper Great Lakes to
the Southern Plains by Friday.

The new energy will create a short-lived light coastal rain and
higher-elevation snow over parts of the Pacific Northwest on early
Wednesday morning. By Wednesday evening, light snow will develop over
parts of the Northern Rockies, expanding into parts of the Northern Plains
and Central Rockies by Thursday morning. By Thursday night, light snow
will extend from the Northern Plains/Upper Mississippi Valley to the
Central/Southern Rockies and Central/Southern Plains. By Friday morning,
the light snow will move into the Upper Great Lakes and Middle Mississippi
Valley, while continuing over the Southern Plains.

Moreover, by Friday, a new front moving onshore over the Pacific Northwest
will trigger coastal rain and higher-elevation snow over parts of the
Pacific Northwest.


Ziegenfelder


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