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.
An unusually strong push of cool air for early September will move southward along the Atlantic Seaboard through the Labor Day weekend before July-like heat returns by next week.
There is a significant chance that Jimena will turn back toward Hawaii and threaten the islands during the second week of September.
As the 2015 college football season gets underway, summertime warmth could lead to uncomfortable games across the Ohio Valley and South while storms roll across the Southeast and Upper Midwest.
The Northwest and Southwest were targeted by gusty, damaging storms, while a rare tropical feat occurred in the Pacific.
Typhoons and building drought will impact more than one billion people in southeastern Asia this fall.
Steering winds could take Ignacio, currently a post-tropical cyclone, into the southeastern arm of Alaska or British Columbia during the middle days of next week.
Cedar Keys, FL (1930)
Hurricane did a double loop near Cedar Keys.
Brownsville, TX (1933)
Hurricane caused $12 million damage; 40 dead.
Flint, MI (1985)
Major flooding occurred in four counties surrounding Flint when a foot of rain fell. Twelve lives were lost, and 63 dollars worth of property was damaged.