Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
153 PM EST Sat Dec 07 2024

Valid 00Z Sun Dec 08 2024 - 00Z Tue Dec 10 2024

...Heavy rain threat emerges across the Deep South late Sunday
into Monday...

...Periods of mixed rain and snow linger from the Great Lakes to
northern New England through the weekend...

...Unsettled and windy weather spreading across the Pacific
Northwest this weekend will reach into the northern Plains as
snow/wintry mix by Monday...

...Well above average temperatures across the Plains today will
expand across much of the area east of the Rockies Sunday into
Monday...


The final hours of below average cold air will sweep away today
into overnight across the South, Southeast and East Coast as the
upper-level trough across the northeast is ushered away with one
last quick moving clipper system traipsing through the Great Lakes
today and into Interior New England through Saturday.  Periods of
mixed rain and snow are expected with the clipper, up to a foot of
snow remains possible for parts near the Canadian boarder.

On the other corner of the CONUS in the Pacific Northwest and
Northern Rockies, unsettled weather ahead of a pair of cold fronts
will trek across the area today into tonight bringing mixed
precipitation with rains in the valleys and snows to the higher
elevations.  Snow levels will drop through the evening/overnight
period into the northern Rockies behind the front and make for
hazardous travel conditions.  Winter Storm Warnings and Advisories
are active across the Washington and northern Oregon Cascades and
expanding eastward into the Northern Washington, Idaho and Western
Montana.  High Wind Warnings also accompany these winter
conditions.  By Sunday morning, a new surface cyclone will develop
across the Southern Canadian Prairies and dive into North Dakota
by late Sunday into Monday.  Snows are likely along the Canadian
border, but mixed precipiation may be more common across the
Dakotas, central Minnesota into far Upper Lakes by early Monday.  
South of the area, the stronger southwesterly winds throughout the
weekend ahead of the system well above average temperatures with
highs in the 50-60s across the northern Plains into Midwest, some
15-25 degrees above normal, only diminishing a few degrees above
normal by Monday over the Midwest/Great Lakes.

Along the Gulf Coast/Lower Mississippi Valley, the tail end of the
cold outbreak has seen a weak surface low develop in the western
Gulf, ahead of an average positively tilted upper-level trough
currently along the Mexican/Southwestern American border.   Some
weak cross Mexican flow will help increase mid-level moisture into
Southeast Texas and Lower Mississippi River Valley and with
warm/unstable air provided by the Gulf and forcing from the
approaching trough aloft will help to develop showers and
thunderstorm activity along/just off-shore today (Saturday)
expanding across E Texas/Louisiana by Sunday evening across the
Lower Mississippi and Delta Region into early Monday morning.  The
overlapping elements coupled with some recent rainfall, results in
the possibility of scattered flash flooding becoming possible. 
The Weather Prediction Center has issued a Marginal Risk of
Excessive Rainfall (level 1 of 4) from SE TX/SW LA Sunday up the
Mississippi River to the KY/TN state lines.

Gallina


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