Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
256 AM EST Mon Dec 26 2022

Valid 12Z Mon Dec 26 2022 - 12Z Wed Dec 28 2022

...A clipper system will deliver snow across the Northern Plains to the
Midwest through 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...

Bands of heavy lake-effect snow have persisted within the persistent
west/northwest winds on the backside of the low pressure system over
southeastern Canada. The system is expected to move further from Canada as
an Alberta clipper tracks quickly across the northern tier states into
Monday. With the clipper system snow will spread across the Northern
Plains and the Midwest as well as a reinforcing shot of cold Canadian air.
Much 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.

The western U.S. will be transitioning to a more active, stormy pattern as
a series of fast-moving low pressure systems move inland and track through
the Intermountain West spreading mixed precipitation across portions of
the Northwest and California. 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.

Campbell


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