The severe storm that killed 32 people moved from the South to the Midwest over the weekend, but another round of thunderstorms hit nearly the same region Tuesday.
Federal forecasters said a front of winds, lightning, hail and rain, the fastest-moving, strongest and longest-running tornadoes possible, would turn south-east of the third region overnight into Wednesday.
The most violent storms tend to occur after dark, causing tornadoes to produce deadly tornadoes twice a day.
Severe storms are expected Tuesday and into the night across a large area stretching from the Great Lakes south to North Texas. Storms will begin earlier in the day in Iowa and Illinois, but not until after midnight across parts of Oklahoma and Arkansas.
For the southern half of the danger zone, more storms will occur overnight. Large hail and winds in excess of 75 mph are all possible.
What’s more, hurricanes as strong as EF-2, with sustained winds of 111 mph, could form cold air from the north and warm, relatively moist air from the Gulf of Mexico collide explosively, forecasters said.
If strong winds aloft change direction and concentrate and supercells and then mesocyclones produce vertical telltales, thunderstorms and storms, the system of conditions will create fruitful tornadoes, as they said.
The most dangerous cities for strong tornadoes include Chicago, Detroit, Indianapolis and Toledo, Ohio.
“If they form,” National Weather Service meteorologist Melissa Byrd said of thunderstorms, “they have the potential for large-scale and powerful tornadoes.”
An estimated 42 million people are at risk for severe weather on Tuesday, according to the NBC Weather News unit. Those changes affected about 62 million people on Wednesday as the storm system reached from northern Michigan to northern Louisiana.
The worst storm is likely to move along a vertical line from Des Moines, Iowa, to Little Rock, Arkansas, the National Weather Service said.
Springfield, Missouri, Cedar Rapids, Iowa, Davenport, Waterloo and Iowa City will connect with the worst of the front, which the weather service describes as having a moderate risk of severe thunderstorms.
“Strong and extremely damaging winds are expected,” the weather service said in a Monday forecast. “There will be strong winds in the afternoon and night across several regions, including the risk of dangerous night time tornadoes.”
The largest city near the most severe storm predicted is St. Louis, where thunderstorms and even some tornado activity are not unusual throughout May. But the earth is struck by time.
“We could see two rounds of severe weather — this afternoon and through tomorrow night,” said Byrd, based in the weather bureau’s office near St. Charles.
North and west of that thunderstorm activity, in Wyoming, the Dakotas and Minnesota, the same front was expected to produce blizzard conditions and the possibility of record amounts of snow — as much as 2 feet in places — for April, according to the weather service. and NBC News are present.
Experts say the continental U.S. and the South are particularly vulnerable to storm damage, where cold fronts from Canada and the Pacific move southeast and collide with tropical air from the Gulf of Mexico, creating the annual storm surge.
But climate change could make extremes worse, with more cold fronts, stronger hurricanes and really bigger hail, as well as longer, hotter summer stretches.
In mid-March, the National Atmospheric and Oceanic Administration’s source-controlled outlook called for major flooding from Minneapolis to St. Louis as drought continued in the northern and central plains.
“Climate change is driving both wet and dry extremes,” NOAA Administrator Rick Spinrad said in the outlook.