Although most of the Northeast and Mid-Atlantic will be precipitation free Friday, lake effect will pile up the snow totals in northwest Pennsylvania, southwest New York and northern New York east of Lake Ontario.
The Tug Hill could pick up well over a foot of new snow by Friday evening.
Highs Friday will be 5 to 15 degrees below average ranging from 23 in northern Maine to the low-to-mid 40s in southern Virginia.
On Saturday, the lake-effect snow bands will shift northward before fading away as a new low-pressure system zips into the Great Lakes. Light snow will streak into western New York and western Pennsylvania during the afternoon, mixing with light rain in West Virginia.
Highs Saturday will range from 26 in Caribou, Maine to 37 in New York City to 46 in Norfolk.
Saturday night, light snow will overspread the region north of the Mason-Dixon Line while light rain, possibly mixed with snow in spots, will infiltrate Maryland, Delaware and the Virginias.
By Sunday, snow showers will linger over much of the region, especially from West Virginia, Pennsylvania and New Jersey northward. Strong northwest winds will add to the chill across New York and the Mid-Atlantic and then New England as the low pressure continues to shift eastward from the Great Lakes to the St. Lawrence Valley. Lake effect snow will first increase downwind of Lake Erie and then downwind of Lake Ontario.
Meanwhile, a storm offshore will head into the Canadian Maritimes and will probably not bring any significant snow to eastern New England.
Highs Sunday will be mainly in the upper 20s and 30s.
After a quiet Monday, a new increasingly windy storm with a one-two, low-pressure punch will take aim on the region Tuesday and Wednesday, bringing mainly rain to the Virginias, Maryland, Delaware, southeast Pennsylvania and south Jersey, snow quickly changing over to rain to the remainder of the Megalopolis and snow to the interior Northeast.
Midwest | View Regional Video
As clipper low pressure zips from south-central Saskatchewan toward the southwest corner of Ontario Friday, a cold front will approach Canada?s border with North Dakota.
Light snow will begin to increase over the Dakotas and northern Minnesota while decreasing for a short time in Michigan.
The rest of the Midwest and Plains will be precipitation free.
After morning lows in the single digits from the Dakotas to the western Lakes, highs will range from the upper teens in the Upper Midwest to the low 40s in Kansas and the high Plains of Nebraska and South Dakota.
The low-pressure system will rapidly push into the Great Lakes Friday night and Saturday as the cold front sweeps southward through the Plains and Midwest. Mainly light snow accumulations will accompany the low?s track and cold front to the tune of 1 to 5 inches from North Dakotas to the Great Lakes.
On Saturday, strong north-to-northwest winds will develop from the Mississippi valley into the Great Lakes and Ohio Valley.
Lake-effect snow will redevelop across northern Wisconsin, Upper Michigan and then western Lower Michigan.
Ahead of the cold front, snow showers or chilly rain showers will dampen the Ohio Valley.
Highs Saturday will range from the teens in the eastern North Dakota and northern Minnesota to the low 50s in southern Kansas.
Strong gusty northwest winds over the Great Lakes and Ohio Valley will gradually subside from west to east on Sunday. Lake-effect snows will continue over parts of Michigan, Indiana and Ohio.
Meanwhile as milder air tries to push in from the West, a light overrunning snow could develop in western North Dakota.
On Monday, with a new cold front dipping into the northern Plains from Canada while low pressure tries to develop over the south-central Plains, the region will turn unsettled once again as a new storm begins to evolve.
Light snow will spread from the northern Plains to the Great Lakes, mixing with rain from Nebraska to Illinois. Showers will develop from eastern Kansas into the lower Ohio Valley.
Tuesday, low pressure will track from Oklahoma into Pennsylvania, generating rain the Ohio Valley, snow in the Great Lakes and a transitional mixture of both in between.
Tuesday night and Wednesday, a second low pressure area will race northeastward from the northern Gulf Coast toward New England, prolonging the rain and snow in the upper Ohio Valley.
South | View Regional Video
As the cold front slowly slides off shore, showers will be slow to exit the Southeast Coast from eastern North Carolina to northern Florida Friday.
The remainder of the South will be precipitation free.
Highs Friday will range from the 40s over west Texas, Oklahoma, Arkansas, the Tennessee Valley and much of the Carolinas to the 70s over the Florida Peninsula.
On Saturday, low pressure will develop off the Southeast Coast and then track away toward the Canadian Maritimes. This developing storm will fortunately produce little trouble for the coastal Southeast and Florida other than a few showers.
The Midwest clipper system may pop a few showers in northern Tennessee later Saturday.
Otherwise the South will be dry.
Highs Saturday will range from the 60s and low 70s in Texas to the 40s in interior North Carolina and the 70s (80 for Miami) across the Florida Peninsula.
After a dry Sunday, a developing central storm will begin to pop showers and a few thunderstorms in the south-central states on Monday.
Tuesday and Wednesday, rain and thunderstorms will shift eastward through the lower Mississippi River Valley and Southeast as two low-pressure areas track along the advancing cold front.
West | View Regional Video
As a clipper low-pressure system zips across western Canada toward the Great Lakes, it will generate a few snow showers along the Canadian border from Washington to Montana on Friday.
The remainder of the West will be dry.
Highs will range from the 30s and low 40s in much of Idaho, Montana, Wyoming and Colorado to the 70s in the Desert Southwest.
On Saturday, disturbances coming out of western Canada along a northwest-to-southeast-oriented jet stream will bring some snow to the northern and central Rockies and adjacent northern high Plains.
Daytime temperatures will be a little higher Saturday especially across the Northwest where more spots in Montana, Wyoming and Idaho will move into the 40s.
On Sunday, a new Pacific system will move into western Canada, bringing showers and mountain snow into Washington, Oregon, northern Idaho and western Montana.
On Monday as a storm begins to organize in the central states, the northern and central Rockies and adjacent high Plains will see more snow, possibly mixed with rain at the lowest elevations.
Tuesday and Wednesday will bring more scattered mainly light showers and snow showers to parts of the Northwest.