Blizzard warnings were posted from Colorado to Minnesota on Wednesday and wildfires were a concern in New Mexico, Texas and Oklahoma as the second so-called “bomb cyclone” storm in less than a month hit the central U.S., raising the prospect of renewed flooding in the already drenched Midwest.

Heavy snow began disrupting ground and air travel Wednesday afternoon. Roads became impassable and visibility was down to a few feet in northeastern South Dakota due to snowfall of up to 11 inches. About half of the daily flights at Denver International Airport were canceled.

Up to 2 1/2 feet (0.61 meters) of snow was expected to fall in parts of eastern South Dakota and southwestern Minnesota, the National Weather Service said. Winds in excess of 50 mph (80.46 kph) also were expected, creating life-threatening conditions.

“We’re calling it historic because of the widespread heavy snow. We will set some records,” said Mike Connelly, a weather service meteorologist in Aberdeen, South Dakota.

The storm caused messy roadways in Albert Lea and the surrounding areas through the afternoon Wednesday, leading to the early dismissal of Albert Lea Area Schools and the closure of southbound I-35 near Faribault for multiple crashes. Albert Lea is under a winter weather advisory through Saturday and is expected to avoid much of the snow expected in other parts of the state.

Transportation officials closed Interstate 29 from east central South Dakota to the North Dakota border and said other stretches of major interstates were likely to close as conditions deteriorated. Numerous traffic crashes were reported in northeastern South Dakota.

Transportation officials in Colorado said highway closures also were likely there. In Nebraska, the State Patrol was sending additional troopers into the state’s panhandle, and officials closed Interstate 80 in that region.

“This storm is going to be dangerous,” Patrol Maj. Russ Stanczyk said.

An unusual but not rare weather phenomenon known as “thunder snow” — snow accompanied by thunder and lightning — was reported in central South Dakota.

“It’s essentially a thunderstorm, but it’s cold enough for snow,” Connelly said.

South Dakota Gov. Kristi Noem closed state government offices in 52 counties. Numerous schools around the state closed, along with several Black Hills National Forest offices in western South Dakota and eastern Wyoming.

Nebraska Gov. Pete Ricketts extended five weather-related executive orders until May 15 to help communities gain fast access to the state’s emergency resources. Minnesota Gov. Tim Walz said “the National Guard stands ready” to rescue any stranded motorists.

The weather service posted an ice storm warning into Friday morning for a portion of southern Minnesota, saying up to three-fourths of an inch of ice could accumulate on power lines, leading to outages.

To the west, the looming spring blizzard in the Rockies was impacting flights, school classes, government functions and even baseball.

Major League Baseball’s Colorado Rockies postponed an afternoon game against the Atlanta Braves until August. Many school districts in Colorado and Wyoming canceled or shortened classes. Local governments, including in Denver and Cheyenne, Wyoming, and state government in the Denver area closed offices early.

Strong winds associated with the weather system were creating dangerous wildfire and travel conditions in New Mexico, Texas and Oklahoma.