Residents of Spencer, Iowa woke up to a temperature of 24 degrees, Sunday morning. Sub-freezing temperatures were common across Iowa Sunday.
If that is not cold enough, it was only 18 degrees in Tioga, North Dakota, Sunday morning. This ties Stanley, Idaho for the coldest temperature in the continental United States for the month of September.
The freezing temperatures across Iowa marks an end to the growing season. It has been a difficult season for farmers across the state, and the Midwest and general. The good news is, the crops that survived the drought have advanced far enough so that impacts from the freezing temperatures were minimal.
Iowa will not be the only state feeling the chill. Frost and freezing advisories are in effect as far south as Kentucky, Monday morning.
Overnight lows will dip into the mid- and upper 30s across the Cincinnati metro area. The last time temperatures were this cold in Cincinnati was the middle of April.
Even the Southeast will be feeling the chill. Temperatures Monday in Raleigh, North Carolina will be as cold as any day since early May.
Temperatures will be cold enough for frost anywhere from Indiana, east across Pennsylvania and New York Monday morning. Temperatures will be chilly across much of the East again Tuesday morning. Most locations will see significant warming Wednesday.
Rising temperatures and humidity across the mid-Atlantic will have it feeling like the end of June.
Slow-moving showers and storms will bring heavy rain and flooding potential.
Heavy rain returning to the northern Plains will generate a renewed flood threat for the Red River.
More than 20 tornadoes were reported by the National Weather Service with hundreds of hail and wind reports Sunday afternoon through Sunday night.
Several tornadoes touched down from Oklahoma to Iowa, including near Wichita, Kan., and Oklahoma City, on Sunday.
Severe storms may erupt from Oklahoma to Wisconsin on Monday as the storm system that spawned several tornadoes across the Plains on Saturday and Sunday shifts slowly to the east.
Niagara, Ontario (1996)
During a showing of the movie "Twister" at a local drive-in, a real twister struck. There was some flying debris, but nobody was hurt.
Alberta, Canada (1992)
Snowfall of 1-2" between Edmonton and Grand Prairie.
Ft. Myers, FL (1985)
A hospital and several homes were evacuated due to brush fires.