Some Midwesterners will wake up to the first frost and freeze of the season this week, while others around the northern Great Lakes may witness the first snow flakes of the season.
Drastically colder air is surging into the Midwest behind a cold front, allowing temperatures to plummet by 20-30 degrees.
Clear and calm conditions behind the front will allow for temperatures to drop near and below freezing across eastern portions of the Dakotas, Minnesota, northern Iowa and northwestern Wisconsin early Tuesday morning.
Fargo, N.D., Aberdeen, S.D., International Falls and Duluth, Minn., are among the cities and towns that will have their first frost or freeze of the season.
Any outdoor plants in pots should be brought inside, gardens should be protected and scrapers should be handy for frosty windshields.
On Wednesday morning, colder air will reach even farther south and east. There is potential for a frost as far south as northern portions of Illinois.
With chilly air moving across the very warm water of the northern Great Lakes, a few snow flakes could fly or mix in with rain showers around the Upper Peninsula of Michigan on Tuesday night. According to the National Oceanographic Data Center, water temperatures are still in the lower 60s in Lake Superior.
While no snow accumulations are expected, seeing snow flakes may catch some off-guard so early in the season.
Warmer air will build from California to Washington on Monday and Tuesday raising temperatures to near-record levels.
Waves of arctic air invading the eastern half of the United States this week will culminate with the coldest weather of the season so far for some areas by the second weekend of February.
The new week will bring more opportunities for snow to create slick travel in the northeastern United States, starting with a winter storm set to sideswipe New England on Monday.
As the first of several waves of arctic air sweep southeastward across the Midwest, just enough snow will occur to cause slippery travel over a broad area into Monday.
Cold and snow showers are in store for the New Hampshire primary on Tuesday but should not significantly impact voter turnout.
As the Denver Broncos and Carolina Panthers clash for the Super Bowl 50 title in Santa Clara, California, on Sunday, they will do so in one of the most energy-efficient stadiums in the world.
Door County, WI (1985)
Up to 30 in. of snow over the past 2 days in parts of Door County, WI (NW of Green Bay). Lake squalls.
Johnstown, PA (1986)
Lightning during a snowstorm set fire to a church and caused damage.
Boston, MA (1861)
46 degrees on this date, -14 degrees on the 8th, and 60 degrees on the 11th.