Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
247 AM EST Tue Dec 07 2021

Valid 12Z Tue Dec 07 2021 - 12Z Thu Dec 09 2021

...Below average temperatures and light snow showers forecast throughout
the Midwest, Great Lakes, and Northeast over the next few days...

...Heavy snow possible across parts of the Sierra Nevada and Intermountain
West starting Wednesday night...

A departing storm system lifting farther north into eastern Canada this
morning and a potent cold front exiting into the western Atlantic will
leave behind a true winter airmass throughout the north-central and
eastern U.S. today. The cold westerly winds will also lead to lake effect
snow showers downwind of the Great Lakes. Light snow is possible into the
Upper Midwest as well, thanks to a weak low pressure system entering the
region. The coldest temperatures will be found across the northern tier
and into the Upper Great Lakes, with highs only reaching into the teens
and 20s. By Wednesday morning, an upper level trough swinging through the
Ohio Valley will produce the chance for light snow showers to develop in
the Ohio Valley and northern Mid-Atlantic. Meanwhile, a developing coastal
low along the Carolina coast is expected to move northeast and rapidly
strengthen east of New England. As a result, a period of light snow is
possible across parts of Massachusetts, New Hampshire, and Maine into the
overnight hours on Wednesday. Additionally, showers and isolated
thunderstorms are expected along a stationary boundary draped across the
Southeast on Wednesday.

For the western United States, periods of light mountain snow and
scattered coastal/lower elevation rain showers are expected throughout
much of the region today. Parts of Southern California may also see a few
raindrops as an upper level low drops southward along the West Coast. A
deep upper level trough and strong cold front is then forecast to enter
the Northwest on Wednesday before pushing into the central Great Basin by
Wednesday night. Heavy snow is possible throughout the Cascades and into
the Sierra Nevada, where snowfall accumulations over 8 inches are
possible. As cold air filters into the Intermountain West, snow is likely
to fall across the lower elevations into Thursday morning for portions of
central and northern Nevada.

Snell

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