Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
300 PM EST Sun Dec 25 2022

Valid 00Z Mon Dec 26 2022 - 00Z Wed Dec 28 2022

...A clipper system will deliver snow across the northern Plains to the
Midwest through tonight into Monday...

...Lingering lake-effect snows downwind from Great Lakes will slowly
become less intense...

...Increasingly stormy weather with heavy mixed precipitation expected to
impact the West Coast next couple of days before spreading into Rockies...

...Arctic air enveloping much of the eastern half of the U.S. will be slow
to moderate...

On this Christmas Day, persistent west to northwesterly winds on the
backside of a low pressure system centered in southeastern Canada
continues to support bands of heavy lake-effect snow, especially downwind
from the lower Great Lakes.  The low pressure system is forecast to move
further away into Canada as an Alberta clipper tracks quickly across the
northern U.S. into Monday.  A period of snow is expected to accompany this
clipper from the northern Plains through the Midwest tonight into Monday. 
The clipper will also bring a brief reinforcing shot of arctic air into
the northern Plains on Monday behind the system.  Much of the rest of the
eastern U.S. will remain in a deep freeze through Monday before a
moderating trend sets in on Tuesday.  Lake-effect snows will continue to
result in locally hazardous travel conditions for the next couple of days
but conditions are expected to slowly improve as we head into the last
week of 2022.

Meanwhile, a period of increasingly stormy weather is forecast for the
western U.S.  In contrast to the frigid weather across the East, much of
the western U.S. will be milder than seasonal average as a series of
fast-moving low pressure systems is expected to impact the West Coast in
the next couple of days. Mixed precipitation associated with the first
system has already overspread Washington, northern Idaho and western
Montana on Christmas Day. The next system will then usher another surge of
moisture toward the Pacific Northwest and farther south into northern
California on Monday, with heavier and more widespread precipitation
penetrating farther inland.  By Tuesday, a much stronger low pressure
system is forecast to bring an even more potent surge of moisture into the
Pacific Northwest and farther south into California.  A few inches of
rainfall is possible down the West Coast into central California by
Tuesday where the potential threat for local flash flooding will continue
to be monitored.  Very strong winds will become a concern as well on
Tuesday in these areas, especially near the coast and at higher elevations
as the center of this potent low is forecast to reach coastal Washington
later on Tuesday.

Kong


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