...Wet snow over parts of the Upper Great Lakes to the Northeast and
Central Appalachians...

...Rain over parts of the Pacific Northwest and wet snow over parts of the
Northern Cascades...

...Lake Effect rain south of the Great Lakes...

High pressure over Central Canada will move southward to the Middle
Mississippi/Ohio Valleys by Wednesday. The clear sky and calm wind
associated with the high have triggered Freeze Warnings, Advisories, and
Watches over parts of the Midwest.

Moreover, an upper-level low over the Northeast to the Great Lakes will
produce lake-effect rain south of the Great Lakes over parts of the Ohio
Valley and Central Appalachians through Wednesday afternoon. Wet snow will
develop over parts of the Huron Mountains of Michigan s Upper Peninsula
through Tuesday night. In addition, rain and wet snow at higher elevations
will develop over parts of the Northeast through Wednesday evening. Wet
snow will also develop overnight Tuesday over parts of the highest
elevations of the Central Appalachians through Wednesday.

Meanwhile, easterly flow off the Gulf of Mexico will help produce showers
and thunderstorms over parts of the Western Gulf Coast on Wednesday.
Additionally, tropical moisture over the Florida Keys will keep showers
and thunderstorms in the forecast through Wednesday.

Furthermore, a front moving onshore over the Pacific Northwest late Monday
afternoon will move inland to the Northern Rockies and Northern California
by Wednesday evening. The system will produce light rain over parts of the
Pacific Northwest through Wednesday afternoon. On Wednesday, the rain will
expand into the Northern Intermountain Region. Moreover, wet snow will
develop over parts of the highest elevations of the Northern Cascades on
Wednesday.

Upper-level dynamic associated with an upper-level low over the Southwest
will aid in producing widely scattered showers and thunderstorms over
parts of the Great Basin, Southwest, and Central/Southern Rockies from
Monday into Wednesday evening.