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Severe Storms Come With Heat in Minneapolis, Green Bay

Building heat and humidity will not only replace the recent record chill across the North Central states but will also fuel ignite severe weather as the weekend transitions to the new week.

Severe thunderstorms will first erupt later Sunday with another round to follow Monday through Tuesday.

Northern Minnesota and northwestern Ontario will become the targets of Sunday's violent thunderstorms in the afternoon and evening.

This includes International Falls and Hibbing, Minnesota, as well as Thunder Bay, Ontario. The westernmost extent of the threat zone reaches to Grand Forks, North Dakota.

A storm system emerging from the Rockies will then fuel severe thunderstorms in a west-to-east fashion from the Dakotas to the western Great Lakes Monday afternoon through Tuesday.

Cities in the threat zone for the first part of the week include Bismarck and Fargo, North Dakota; Pierre, Aberdeen and Sioux Falls, South Dakota; St. Cloud, Minneapolis and Rochester, Minnesota; Green Bay and Madison, Wisconsin; and Marquette, Michigan.

The strongest thunderstorms Sunday through Tuesday will be capable of producing damaging winds, hail, flooding downpours and a few tornadoes.

After the violent thunderstorms from Monday afternoon and evening cluster together, the main danger for a time Tuesday morning will likely be flooding rain in the vicinity of northern Wisconsin.

A new line of severe thunderstorms will then erupt to the south and east (around Lake Michigan) later Tuesday.

AccuWeather.com Meteorologist Andy Mussoline is concerned for the severe weather to reach Madison and Milwaukee, Wisconsin, Tuesday afternoon.

"I am even worried about the thunderstorms reaching Chicago Tuesday evening," Mussoline continued.

A key ingredient to the impending severe weather danger across the northern Plains and Upper Midwest is the building heat and humidity that will bring some communities the hottest weather so far this summer.

The heat comes on the heels of the record chill that made caused the start of the recent week to feel more like September or early October than the middle of July.

After the high of 65 F last Monday set a record for the day's coolest high temperature, Minneapolis should see temperatures soar close to 95 F this coming Monday. The highest temperatures have risen yet this year is the 90-degree mark.

The passage of the severe weather will open the door for more comfortable air to return to the North Central U.S. for midweek. A repeat of the record chill is not in the offing.

As that occurs, AccuWeather.com meteorologists expect the severe weather danger to shift to the Ohio Valley and eastern Great Lakes on Wednesday and then the I-95 corridor of the Northeast and mid-Atlantic on Thursday.