Weather Wednesday December 11 2024 Heavy Rains in the Northeast

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...Widespread heavy rain threat developing from the central and eastern
Gulf Coast to the entire East Coast tonight into Wednesday...
...Arctic air to plunge south and eastward across the northern Plains,
Upper Midwest, and Great Lakes tonight into Wednesday...
...Another round of significant lake effect snow to begin Wednesday and
continue through Thursday downwind of the Lakes...
A developing storm system over the Southeast U.S. is set to bring
widespread heavy rains from the central and eastern Gulf Coast to the
entire East Coast tonight into Wednesday. A wave of low pressure will
rapidly strengthen and move northeastward across the interior Mid-Atlantic
and Northeast, dragging a strong cold front along with it. Ahead of the
front, warm and moist air will set the stage for numerous showers and
thunderstorms, some of which could become strong to severe. This is
especially the case across eastern North Carolina on Wednesday, where the
Storm Prediction Center has issued a Slight Risk (level 2 of 5) for severe
thunderstorms capable of producing damaging wind gusts. Elsewhere along
the Eastern Seaboard, the main concern will be a period of heavy rain with
embedded strong thunderstorms and intense downpours. Despite much of the
region currently experiencing moderate to extreme drought conditions, the
rain, while mostly beneficial, could still lead to some localized
instances of flash flooding. The more urbanized locations and poor
drainage areas would have the greater risk of flooding issues.
The cold front will sweep across the East Coast Wednesday into Thursday,
with much colder air surging in from the north and northwest in its wake.
This Arctic blast will first plunge into the northern Plains and Upper
Midwest tonight before expanding eastward across the Great Lakes,
Mid-Atlantic and Northeast Wednesday and Thursday. High temperatures the
next couple of days will be roughly 10 to as much as 30 degrees below
normal. The cold post-frontal air mass will also help to change rain to
snow across the western slopes of the Appalachians and interior portions
of New England and the Northeast with at least modest accumulations
looking like a decent bet.
Attention then turns to yet another round of significant lake effect snow
downwind of the Great Lakes Wednesday through Thursday. The aforementioned
Arctic air will stream across the still relatively warm Great Lakes and
ignite intense bands of lake effect snow, initially downwind of Lakes
Superior and Michigan on Wednesday and then downwind of Lakes Erie and
Ontario Wednesday night into early Thursday. By the time the snow starts
to taper off on Friday, snowfall totals of 1 to 2 feet are likely in the
favored Snow Belt across portions of northwest and western New York State,
far northwest Pennsylvania, far northeastern Ohio, the Upper Peninsula of
Michigan and the western portions of the Lower Peninsula of Michigan.