5:32 p.m. CDT: "Funnel cloud headed toward I-94 with poor visibility reported," Stearns Co., MN police scanner.
5:30 p.m. CDT: "Golf ball-sized hail right now," from Stearns Cunty, Minn. police scanner
5:05 p.m. CDT: Two tornado reports are coming out of Pope County, Minn., near Brooten and in Sedan as storms heat up across the Upper Midwest.
4:20 p.m. CDT: Hail with diameters up to 1.25 inches covered the ground with drifting reported.
Severe thunderstorms will ignite across the upper Mississippi Valley later this afternoon and tonight.
Places that will need to keep an eye out for damaging severe storms include St. Cloud, Minneapolis and Mankato, Minn., Sioux Falls, S.D., and Omaha, Neb.
The greatest risks will be large hail, locally damaging wind gusts, flash flooding and a few tornadoes.
Hail the size of baseballs and wind gusts to 60 mph can cause significant damage to automobiles, homes, trees and power lines.
Torrential downpours are capable of causing flash flooding. Heavy rain that falls in a short amount of time can lead to roadways becoming submerged in quickly rising water, especially in low-lying and poor drainage areas.
Never drive on a roadway that has been completely covered with water. Turn around and seek a safer alternative route to your destination.
There will also be the threat for isolated tornadoes. Heed all watches and warnings and be prepared to take action if a warning is issued for your area.
A storm system will move eastward from the northern Rockies into the northern Plains later today. Out ahead of the storm, warm and moist air will stream northward into the region, creating an atmosphere conducive for explosive thunderstorms.
Later in the afternoon and at night, after daytime heating has taken place, a cold front will slice into the region from the northwest.
The cold front will act as a trigger for damaging severe thunderstorms to erupt.
Strong to severe storms will also fire across parts of western Texas this afternoon.
While the threat is much more isolated today, some places that were hit with severe storms on Monday will be in store for another round this afternoon.
Cities in the threat zone include Amarillo, Lubbock and Midland.
Residents in this area should be on the lookout for thunderstorms capable of producing large hail and strong, potentially damaging winds.
A boundary separating very dry air from very moist air, also known as a dry line, will provide the spark for thunderstorms to ignite later this afternoon.
Keep checking back with AccuWeather.com for the latest severe weather updates.
After an earthquake hit in the area, the Bardarbunga volcano erupted Friday in Iceland, causing a temporary no-fly order.
The North Central states face the most adverse weather this Labor Day weekend, in the form of severe storms and tornadoes which will threaten lives and travelers.
As Cristobal loses its tropical characteristics, attention is turning toward the Bay of Campeche for potential development next week.
The Pittsburgh area will have a turbulent stretch of sun and intermittent thunderstorms for the next several days, including storms that could impact Labor Day weekend plans.
An outbreak of severe weather, including tornadoes, will evolve on Sunday from the northern and central Plains to part of the Upper Midwest.
After another big cooldown, warm and humid weather will bounce back in Boston, during the Labor Day weekend.
New England (1965)
A total of 2.5 inches of snow on top of Mt. Washington set an August record. Vermont had a reading of only 25 degrees, while Nantucket had a chilly 39 degrees. Earliest freeze on record at many stations.
Houston, TX (1980)
2.23 inches of rain fell in less than 1 hour. Streets were flooded in the downtown district and a tornado touched down briefly west of Houston at Sealy, TX.
Pittsburgh, PA (1982)
39 degrees, coldest ever in August.