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.
The risk of flooding downpours and gusty thunderstorms will spread toward southern Florida as a tropical disturbance spreads northwestward from Cuba.
Following a tropical threat for the United States Gulf coast next week, an uptick in tropical systems will continue for the next six to eight weeks.
After showers threaten to spoil outdoor plans over the weekend, Monday will feature great weather for the bank holiday in Wales and England.
On the heels of deadly Typhoon Mindulle, Typhoon Lionrock is poised to make landfall in Japan early next week with heavy rainfall, damaging winds and an inundating storm surge.
Relief from the heat baking Germany this weekend will come by early next week, but not before violent thunderstorms threaten northern areas to end the weekend.
President Obama visited flood victims in Louisiana this week, while several tropical systems were on the prowl in the Atlantic.
Lake Okeechobee, FL (1949)
Hurricane sends 155-mph winds against levees but the disaster of 1928, when the levees broke, was not repeated.
Kiana, AK (1976)
A weak tornado occurred, about 2.9 miles north of the Arctic Circle.
Elizabeth, PA (1979)
A heavy thunderstorm at Elizabeth, PA, 20 miles SE of Pittsburgh, tore the roof off an apartment building and downed about 100 trees. Trees were also knocked over at McKeesport, PA.