The Weather Prediction Center

Short Range Forecast Discussion

[Abbreviations and acronyms used in this product]
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Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
300 AM EST Sun Dec 04 2022

Valid 12Z Sun Dec 04 2022 - 12Z Tue Dec 06 2022

...Heavy snow in the Sierras; snow spreading from northern and
central Rockies into the northern High Plains; isolated flash
flooding possible in parts of California and Southwest...

...Heavy rain threat increasing over Tennessee Valleys/interior
Deep South from Monday through Tuesday morning...

...Cold air being ushered into the eastern U.S. behind a front...

A fresh dose of cold air from Canada is being ushered into the
eastern U.S. early this morning behind a cold front.  A large high
pressure system centered over the mid-section of the country will
build eastward to provide fine and dry weather from the Midwest to
the East Coast through Monday.  Meanwhile, a low pressure system
off the West Coast continues to pump Pacific moisture onshore into
California this morning.  This system will be rather slow-moving
as it dumps heavy snow into the Sierra Nevada while periods of
moderate rain, heavy at times, will impact the lower elevations
especially the northern coast of California for the next couple of
days.  The moisture will then be carried farther inland and
precipitated as snow across the Intermountain West and into the
northern and central Rockies through Monday.  By Monday night into
early Tuesday, a cold front dipping southward from western Canada
will interact with the Pacific moisture to bring a period of snow
over the northern High Plains as a low pressure wave forms along
the front.

Farther south, another plume of moisture associated with the
subtropical jet stream is spreading an axis of of enhanced
rainfall this morning from southern Arizona across New Mexico and
into the southern High Plains where temperatures are cold enough
to support frozen precipitation.  This jet stream will be
instrumental in setting up a potential heavy rain event across the
interior Deep South into the Tennessee Valley during Monday and 
especially Monday night into early Tuesday as the Gulf moisture is
lifted ahead of a warm front.  Rain is forecast to expand
northeastward toward the Ohio Valley and eventually reaching the
Northeast with mixed precipitation possible Monday night and early
Tuesday ahead of a cold front advancing into the Midwest and
across the Great Lakes.


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Last Updated: 300 AM EST Sun Dec 04 2022