The U.S. National Weather Service issued blizzard warnings for northeastern Colorado, southeastern Wyoming, western Nebraska and parts of the Dakotas - where travel was almost brought to a halt due to the weather conditions.
Trees snapped by high winds from a late winter storm packing hurricane-force winds and snow cover the Eugene Field house in Washington Park Wednesday, in Denver.
The National Weather Service predicts "much calmer" weather in most areas this weekend.
Many central Iowa rivers may see moderate flooding into next week from the rain and snowmelt runoff, the weather service said. Some flood watches and warnings were in place in the midwest as rain will spur accumulated snow to melt, he said.
In areas near Fargo, North Dakota, no travel was advised, as heavy snow and poor visibility prompted the closure of two interstates.
A disaster proclamation by Iowa Governor Kim Reynolds, issued in response to reports of flooding, remained in effect in Iowa overnight. Residents of communities that had to evacuate because of flooding will be cleaning up the damage for some time.
Bria McKenzie, 22, said she and her mother, brother and sister were stuck in their auto for more than two hours on a hilly road in Colorado Springs.
Parts of seven states were under blizzard warnings, and 20 states were under some level of high wind alert, Carbin said.
The window-rattling storm brought blizzards, floods and tornadoes, stretching from the northern Rocky Mountains to Texas and beyond.
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On Wednesday up to 1.2 meters of snow and 170-km-per-hour winds blasted Colorado, leaving thousands of motorists stranded and tens of thousands of people without power in Colorado and Texas.
"We do know that here is a link between the warming Arctic and the weather patterns in the mid-latitudes", she said. And in New Mexico, 36 miners at a nuclear waste repository were trapped underground in an elevator for about three hours because of a power outage caused by the extreme weather. It was caused by a combination of the jet stream and normal conditions in the wind shadow of the Rockies.
As authorities scrambled to rescue drivers, Colorado State Patrol Corporal Daniel Groves was killed after being struck by a vehicle while helping a stranded driver.
The Colorado National Guard announced it had rescued 93 people and two dogs after inspecting about 250 vehicles.
A bomb cyclone occurs when there is a rapid pressure drop that occurs over the course of 24 hours.
Five people were hurt and 150 dairy cows had to be euthanized when a tornado hit the small town of Dexter, New Mexico, on Tuesday. Michigan State Police said first-responders confirmed at least 21 homes were damaged, but no injuries were immediately reported.
Parts of Kentucky and IN have been under tornado warnings Thursday - and one touched down IN Union County, Ky., where a motorist recorded video of the twister on his cellphone.