Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
228 PM EST Tue Dec 21 2021

Valid 00Z Wed Dec 22 2021 - 00Z Fri Dec 24 2021

...Low pressure system will spread snow across the Great Lakes tonight and
then a quick round of heavy snow for Maine later on Wednesday...

...Unsettled weather spreads farther south from the Pacific Northwest into
California as well as farther inland across the Northern Rockies...

...Critical Fire Weather for parts of the Front Range on Wednesday...

A low pressure system will travel up and away from the Southeast coast
tonight. This system will generate rain showers and isolated thunderstorms
for parts of the East Coast tonight before moving off into the Atlantic
tomorrow. Another system, currently tracking across the Upper Midwest,
will go on to produce light snow showers across the Great Lakes tonight
into Wednesday. As this system intensifies tomorrow, snow rates will pick
up across parts of western and northern Maine, leading to the accumulation
of 6-10 inches of snow by Wednesday evening. Some light freezing rain may
mix in over parts of interior New England.

Ongoing troughing in the West will contribute to a heavy mountain snowfall
threat and moderate coastal/low elevation rainfall over the next few days.
Over the Cascades and Sierra, between 2-4 feet of snow are likely with
isolated areas likely to receive more. Much of the Northern Rockies will
get between 1-2 feet through Thursday. Parts of southeastern Washington
may pickup some light freezing rain as well. Snow and rain will shift
south across much of California on Wednesday and especially Thursday, when
the heaviest snow is expected to fall over the Sierra. Many areas along
the West Coast will accumulate 2 or more inches of rainfall by Thursday
night. Critical Fire Risk is in effect for parts of southeastern Wyoming
and northwestern Nebraska tomorrow, as winds pick up due to the arrival of
a surface low pressure system and humidity remains low. Temperatures will
steadily rise above average across the Great Plains over the next few days
as a dome of high pressure moves into the region.

Kebede


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