Incredibly Cold and Record Breaking Temperatures, Heavy Snow and Ice Are Expected

For the Eastern Two-Thirds of the Country Through Next Week.

Heavy snow possible from parts of the Lower Missouri Valley into the
Great Lakes…

…Freezing rain is possible over interior Northern New England/Northern

…Temperatures will be 30 to 50 degrees below average from the
Northern/Central High Plains to the Upper Mississippi Valley…

coldweather_small11 Incredibly Cold and Record Breaking Temperatures, Heavy Snow and Ice Are Expected  Cold high pressure over West-Central Canada will move southeastward to the
Southern Plains by Monday evening.  Cold temperatures associated with the
high will move southward over the Plains into the Ohio Valley while

 Upslope flow associated the clockwise circulation around the
high will produce light snow over parts of the Northern/Central High
Plains and parts of the Northern/Central Rockies on Sunday morning,
tapering off to a small area of snow over the Central Rockies by Sunday
afternoon before ending by Sunday night. 

Meanwhile, a front extending from the Great Lakes southward to the Western
Gulf Coast will develop a wave of low pressure over the Lower Mississippi
Valley that will move northeastward into Southeastern Canada by Monday.
The boundary will move eastward off the Eastern Seaboard by Monday
afternoon as well. 

The system will produce moderate snow from parts of
the Mississippi Valley into the Great Lakes that will move into the Lower
Great Lakes/Southern Ontario by Sunday evening, becoming light snow over
Central Appalachians/Lower Great Lakes by Monday morning.

The storm will also produce light to moderate rain over the Tennessee Valley into

the Northern Mid-Atlantic, with a narrow band of rain/freezing rain over parts
of the Lower Mississippi Valley into the Ohio Valley on Sunday morning.
Another area of rain/freezing rain will develop over parts of the
Mid-Atlantic on Sunday morning, too, moving into parts of Northern New
England by Monday morning. 

Light to moderate rain will also move into
Southern New England by Monday morning before ending by Monday evening.
In the wake of the storm, lake effect snow will develop downwind from the
Great Lakes Sunday night into Monday evening.

Upper-level energy will begin to move onshore over the Pacific Northwest
by Monday evening.  The energy will trigger scattered light rain over
parts of the region on Monday evening.