Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
314 PM EST Tue Dec 07 2021
Valid 00Z Wed Dec 08 2021 - 00Z Fri Dec 10 2021
...Long awaited heavy snow to arrive over the Central Rockies late this
...Cool temperatures and light snow expected for parts of the Great Lakes
and Northeast over the next few days; warm air expands across Plains...
...Heavy snow possible across parts of the Sierra Nevada and Intermountain
West Wednesday night through Thursday...
An active weather pattern will culminate in the development of a winter
storm over the Central Rockies/Plains towards the end of the week. A
shortwave trough will spawn shallow precip in the form of light snow over
parts of the Midwest tonight before spreading out into the Lower Great
Lakes, Central Appalachians, Mid-Atlantic and up through the Northeast on
Wednesday. A stationary front draped along the Gulf coast and into the
Atlantic will bring rain showers and scattered to isolated thunderstorms
to the region and through much of the Southeast/Carolina coast tonight
through Wednesday. A strong upper-level trough will bring heavy snow to
the Cascades and Sierra Nevada beginning Wednesday and continuing through
Thursday. 1-2 feet of snow are expected for the Northern Cascades while
around a foot is likely over the Sierra.
Heavy snow is then expected to spread into the Intermountain West, Central
Rockies and Front Range Wednesday night and continuing into Friday the
Rockies and Front Range. 1-2 feet with higher locally higher amounts are
likely for much of the Intermountain West and Central Rockies. Heavy snow
really kicks off in earnest across the Front range and into the
Central/Northern Plains and Upper Midwest upon the development of a Winter
storm over the foothills of the Colorado Rockies on Friday . Downstream of
this system, another low pressure system will produce moderate to heavy
snowfall across portions of the Upper Midwest and/Great Lakes on Thursday,
where 4-8 inches of snow with locally higher amounts are expected.
Anomalously warm air will advect into the Plains and Mississippi Valley
out ahead of this winter storm beginning on Wednesday. The warmest
temperatures, on the magnitude of 15-25 degrees above average will be felt
over the Southern Plains through the Midwest on Thursday and Friday.
Relatively dry conditions and increased wind speeds due to the deepening
surface low will contribute to an Elevated Risk of Fire Weather over parts
of eastern New Mexico and western Texas on Wednesday.
Graphics are available at