A severe thunderstorm watch was issued for parts of the Midwest until 10 p.m. CT Thursday, according to the Storm Prediction Center. The watch was labeled as a “Particularly Dangerous Situation,” or “PDS” watch — a ranking that makes up less than 3% of watches and is reserved for high-end events.
“A prolific wind-damage event is expected unfold from northeast Nebraska into southeast South Dakota and northwest Iowa/southwest Minnesota,” the SPC said, adding that widespread damaging winds and gusts of up to 105 mph were possible, along with hail up to 2 inches wide and a few tornadoes.
Across the region, more than 20 million people were under some kind of severe weather threat Thursday evening and into the night.
By Thursday evening, winds of at least 107 mph — equal to those of a Category 2 hurricane — were recorded in parts of Hutchinson County in southern South Dakota, according to the National Weather Service. Across Nebraska and South Dakota, more than two dozen locations reported winds of at least 80 mph, according to the weather service.
A tornado watch was issued until Thursday night for central and northeastern South Dakota, including Pierre and Aberdeen, according to the SPC, which warned of strong winds and almost baseball-sized hail.
Another tornado watch was issued for western and central Minnesota and southeastern North Dakota until midnight local time, according to the SPC. Strong wind gusts and “very large hail” were also likely, the center said.
Some of the larger cities that need to be keenly aware of the severe weather potential include Minneapolis/St. Paul in Minnesota, Omaha in Nebraska, Sioux City in Iowa, and to a lesser extent Des Moines, Iowa. Even though all hazards are on the table, including tornadoes, the greatest risk appears to be damaging straight-line winds and large hail.
The storms are fueled by hot temperatures
The storms are fueled by temperatures in the region that are more commonly seen in mid-July.
Throughout Thursday, temperature records were broken from the Gulf Coast to the Great Lakes, with states including Kentucky, Missouri and Wisconsin all recording temperatures in the 90s in some areas.
The combination of heat and humidity helped pave the way for the storms.
“Warm and humid air from the Gulf of Mexico has surged northward through the Plains and into the Upper Midwest,” pushing those temperatures into the 90s, CNN meteorologist Taylor Ward said.
“The warm and juicy airmass is providing ample energy to fuel severe storms with wind gusts over hurricane-force, baseball-sized hail and even tornadoes,” Ward added.
Peak of tornado season
Regardless of statistics and monthly averages, the SPC is able to identify areas that are at greatest risk of severe weather.
Just like the forecast for Thursday, conditions are favorable for severe weather development — but this does not necessarily mean you will experience damaging winds, large hail or tornadoes.
CNN’s Taylor Ward contributed to this report.