Thunderstorms set to rumble across the Plains, Midwest into early week

Building heat and humidity across the Plains and Midwest will help to spark another round of severe weather through early this week.

The steamy air across the center and northern tier of the nation is in response to a northward retreat of the jet stream winds, which plays a major role in day-to-day weather. During the summer months, subtle disturbances embedded within the jet stream winds are often responsible for explosive thunderstorm development.

The thunderstorm threat over the coming days will be in direct response to those events.

CLICK HERE FOR THE FREE ACCUWEATHER APP

After thunderstorms rolled across the Upper Midwest Friday night, bringing along heavy rain and locally strong wind gusts to places like Duluth, Minnesota, another round of severe weather fired up on Saturday and Saturday night, this time across South Dakota, Nebraska and western Minnesota.

Hail as large as 4.50 inches in diameter fell in Pennington, South Dakota, according to storm reports from the Storm Prediction Center.

On Sunday, the severe weather continued. Tornadoes were spotted in North Dakota and Minnesota, with a touchdown reported in Pennington, Minnesota. Other reports claimed nickel to quarter sized hail was spotted in both North Dakota and Minnesota, as well.

Multiple wind reports in Nebraska and Wisconsin have taken down trees -- one of which with a diameter of three feet. An observer estimated winds reached up to 60 mph.

On Sunday evening, over 13,000 customers in Wisconsin were out of power, according to poweroutage.us.

Minnesota received reports of damage to vehicle windows and house siding due to debris after experiencing some strong winds, as well.

Conditions will begin to calm down across the Plains and Upper Midwest early this week as an advancing cold front is expected to sweep through the region. In its wake, an area of high pressure is expected to briefly settle in, resulting in quieter conditions.

Meanwhile, the zone of stormy weather will sink southeastward on Monday into Tuesday, bringing drenching thunderstorms from the central Plains to the East Coast.

Keep checking back on AccuWeather.com and stay tuned to the AccuWeather Network on DirecTV, Frontier and Verizon Fios.