Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
300 AM EST Mon Dec 05 2022
Valid 12Z Mon Dec 05 2022 - 12Z Wed Dec 07 2022
...Heavy rain and the risk for scattered flash flooding developing over
the Tennessee Valley...
...Snow across the central Rockies, parts of the northern Rockies, and
extending east into the northern Plains...
...Showers will expand northeast toward New England on Tuesday ahead of a
cold front as rain becomes more focused near the trailing portion of the
front across the southern Plains...
A cold front associated with a reinforcing surge of cold air from Canada
is forecast to move rapidly south through the northern and central Plains
today. Meanwhile, a plume of moisture associated with the subtropical jet
stream continues to trigger scattered precipitation across the southern
Rockies. This jet stream will help develop a wave of low pressure along a
frontal zone across the southern Plains as warm and moist air from the
Gulf of Mexico begins to push northward. Rain is beginning to develop
across the interior Deep South ahead of a warm front. The jet stream
interacting with the warm front in conjunction with the cold front
arriving from the north will help focus a round of heavy rain by later
today from the interior Deep South up into the Tennessee Valley. The
heavy rain axis is forecast to lift slowly northward into Kentucky by
early on Wednesday ahead of the warm front and the wave of the low
pressure. In the mean time, rain chances are expected to increase across
the southern Plains by Tuesday night into early Wednesday near a stalled
front. Farther to the northeast, showers will expand northeast toward New
England on Tuesday ahead of the cold front. An area of enhanced rainfall
is possible Tuesday night into Wednesday morning from the northern
Mid-Atlantic to southern New England.
A low pressure system just off the West Coast is slowly weakening.
Precipitation over northern California is forecast to slowly taper off
today. Farther inland, snow is expected to continue across the central
Rockies, parts of the northern Rockies, and extending east into the
northern Plains near the arctic boundary. Temperatures will remain below
normal while winds will also be a bit blustery along the front of the
Rockies. Meanwhile, bitterly cold air will spread south from Canada into
the northern Plains and upper Midwest. Highs near the Canadian border will
be in the single digits with wind chills running below zero.
Graphics available at