Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
300 PM EST Mon Jan 10 2022

Valid 00Z Tue Jan 11 2022 - 00Z Thu Jan 13 2022

...A cold snap in the eastern U.S. will be followed by expansion of mild
air across the northern and central Plains...

...Relatively dry couple of days for much of the country but unsettled
weather across the Pacific Northwest and lake-effect snows near the Great
Lakes...

Following the passage of a cold front, much of the eastern two-thirds of
the country will enter a period of cold but dry weather for the next
couple of days.  The core of the cold air will move over the Great Lakes
toward New England into Tuesday morning with sub-zero air temperatures
expected.  This will promote lake-effect snow to develop downwind from the
Great Lakes through tonight.  Meanwhile, mild air developing near the
foothills of the northern and central Rockies is forecast to expand
eastward into the Plains behind a warm front.  The influx of milder will
gradually taper off the lake-effect snow machine later on Tuesday into
Wednesday over the Great Lakes.  In contrast, the core of the frigid air
will move over northern England on Tuesday where daytime highs are
forecast to remain below zero at the coldest locations.  A large area of
high pressure will bring dry conditions for much of the central and
eastern U.S.  The exception will be across southern Florida where showers
and some thunderstorms associated with the aforementioned cold front will
linger into Wednesday as the front becomes stationary just to the south.

For the Pacific Northwest, another round of active weather is moving into
western Washington ahead of a low pressure system.  Periods of heavier
rain will then enter the region on Tuesday, which could spawn flooding
concerns.  A Slight Risk of Excessive Rainfall has been issued for Tuesday
across the Olympic Peninsula, where several inches or more of rain falling
on saturated terrain could produce rapid runoff, river flooding, and a
risk of landslides.  Meanwhile, mountain snow is expected to be confined
to the highest peaks of the northern Cascades.  East of the Cascades,
pockets of freezing rain are possible on Tuesday throughout the Columbia
Basin.

Kong


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