The Nation’s Weather

…Heavy snow over parts of the Sierra Nevada Mountains and Upper Great
Lakes with moderate snow over parts of the Central Rockies…

…Temperatures will be 10 to 15 degrees below average over the Northern
Plains…

A front extending from the Middle Mississippi Valley, Central
Plain/Rockies, and Southwest will move eastward to off the
Northeast/Mid-Atlantic Coast and then over the Southeast and off the
Western Gulf Coast by Tuesday evening. A high pressure over West-Central
Canada will usher cold air over parts of the Northern Plains, bringing
temperatures of 10 to 15 degrees below average, while the high moves
southeastward to the Ohio Valley by Tuesday evening.

Weak onshore flow will produce coastal rain and higher-elevation snow over
parts of the Pacific Northwest through late Monday night. More robust
onshore flow will produce rain and higher-elevation snow over parts of
Northern/Central California. The snow will be heavy over the Sierra Nevada
Mountains through Tuesday evening. Additional upper-level energy will move
over the Central Rockies, developing light snow from Sunday evening into
Monday morning. The energy will create moderate to heavy snow over the
Central Rockies from Monday evening into Tuesday evening.

Meanwhile, upper-level energy over the Northeast will produce light rain
over parts of the Lower Great Lakes through Sunday night and
higher-elevation snow over the Northeast through Monday morning. Overnight
Sunday, as the wave of low pressure and associated upper-level energy
moves into the Upper Midwest, moderate snow will develop over parts of
northeastern Minnesota, northern Wisconsin, and the Upper Peninsula of
Michigan. Rain will grow over the Lower Peninsula of Michigan on Monday
and extend into the Ohio Valley. By Monday afternoon, as the precipitation
expands southward, showers and thunderstorms develop over parts of the
Tennessee Valley and the Lower Mississippi Valley. By Tuesday, heavy
lake-effect snow will develop over the western Upper Peninsula of Michigan
and moderate to heavy lake-effect snow over the rest of the Upper
Peninsula of Michigan. Also, rain will move into the Northeast and parts
of the Mid-Atlantic, southwestward to the Central Gulf Coast. The rain
will change over to snow over parts of Northern New England by Tuesday
evening.

Ziegenfelder

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