A storm will move closer to the Great Lakes on Monday, bringing a chance for severe weather to southern Canada through Missouri.
The same system that brought severe thunderstorms and tornado reports to North Dakota on Sunday will make its way eastward to start the workweek.
By the afternoon, strong, and even severe thunderstorms will stretch from Thunder Bay in southern Ontario to Minneapolis, Minn., and La Crosse, Wis., to northern Iowa, including Mason City.
The primary threats as these storms move through will be damaging wind gusts and large hail. Storms also have the potential to bring torrential downpours that could inhibit travel.
However, an isolated tornado cannot be ruled out. The greatest risk for tornadoes extends from northern Wisconsin, north of Wausau into the Upper Peninsula of Michigan to Thunder Bay.
Storms will likely be most severe in the afternoon and evening as the storms move eastward and threaten even more cities. Affected areas from the evening, into the overnight, include Madison, Wis., Cedar Rapids, Iowa, and Kansas City. Chicago also could have a gusty storm.
Again, the primary threat will be hail and gusty, damaging winds.
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.