The storm left quickly rising floods in its wake in parts of eastern Nebraska and Iowa that saw residents evacuated from their homes, roads washed out in communities, and farmers anxious all the water would drown livestock.
Around midday, Sioux Falls' precipitation was expected to turn from rain to snow - which has already brought perilous conditions to the western part of the state. In Colorado, residents are dealing with blizzard conditions, Iowa and IL are facing severe flooding, while rivers are overtopping their banks in Nebraska and Missouri. The state says shelters are now providing aid to more than 100 people who were forced to evacuate their homes, with shelters open in parts of Nebraska, Iowa and Kansas.
"Modeling studies consistently suggest that the frequency and intensity of severe storms in the United States could increase as climate changes, particularly over the U.S. Midwest and Southern Great Plains during spring", she said.
There were no remaining blizzard warnings Friday, Oravec said.
Nebraska Governor Pete Ricketts also issued an emergency declaration after rain-swollen rivers and dam breaches left many bridges and roads impassable and prompted thousands of residents of the farm state to evacuate.
The historic low-pressure system, which affected more than 105 million people this week according to the National Weather Service, continued moving east.
Wednesday's blizzard in Colorado caused widespread power outages, forced the cancellation of hundreds of flights and wreaked havoc on roadways as drivers became overwhelmed by blinding snow.
A wind gust of 92 miles per hour (148 kph) was recorded in the mountains northwest of Denver.
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The window-rattling storm brought blizzards, floods and tornadoes, stretching from the northern Rocky Mountains to Texas and beyond.
In the Texas Panhandle, a utility worker was killed while working to restore power amid strong winds pushed in by the storm.
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.
National Guard troops used specialized vehicles with tank-like treads to rescue stranded drivers. It was caused by a combination of the jet stream and normal conditions in the wind shadow of the Rockies.
Five people were hurt and 150 dairy cows had to be euthanized when a tornado hit the small town of Dexter, New Mexico. When that much air rushes higher into the atmosphere, it causes severe weather.
In parts of Arkansas, Mississippi, Missouri and Tennessee, tornado watches were issued until Thursday afternoon.
In Michigan, a tornado touchdown was reported Thursday in Vernon, southwest of Flint, and in nearby Durand. He police said people should be careful during the exit.