Some flood watches and warnings were in place in the midwest as rain will spur accumulated snow to melt, he said.
A powerful, late-winter "bomb cyclone" storm pushed into the U.S. Midwest and the Great Lakes region on Friday, causing flooding along the MS and Missouri rivers, stranding herds of cattle and raising alarms at a Nebraska nuclear power plant. A bomb cyclone happens when atmospheric pressure drops dangerously low or falling at 24 millibars in 24 hours or less.
In Iowa, a disaster proclamation by Governor Kim Reynolds, issued after reports of flooding on Thursday, remained in effect.
Tornadoes were reported in Michigan, Indiana, Kentucky and Alabama as these storms fired up into the evening.
Firefighters braved blizzard conditions on emergency call-outs in Parker, Colorado, after a "bomb cyclone" swept through the State on March 13.
The "bomb cyclone" slammed the central United States with hurricane-like winds and blizzard conditions this week, leaving in its tracks heavy rains and flooding.
Evacuations also occurred in several other eastern Nebraska communities and at least one Iowa town. Hornick is about 25 miles southeast of Sioux City.
A day earlier, the NWS had described the blizzard - previously dubbed a "bomb cyclone" by USA meteorologists for its quick, late season punch - as being of "historic proportions" in a post on Twitter.
Weather service meteorologist Peter Rogers says flooding is likely to persist into the weekend.
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Highways were also closed in the Nebraska Panhandle, South Dakota and near the Wyoming border on Thursday due to the storm. School buses were used to rescue stranded drivers. Parts of those states are experiencing flooding, especially in low-lying areas near the Mississippi River.
Thirteen tornados were reported Thursday in Kentucky, Indiana and MI, said Bob Oravec, a meteorologist with the National Weather Center's Weather Prediction Center in College Park, Maryland, but no immediate reports of serious damage.
Bria McKenzie, 22, said she and her mother, brother and sister were stuck in their vehicle for more than two hours on a hilly road in Colorado Springs.
The two cities have implemented several measures such as home buyouts and levees since then. Over 3,500 flights have been canceled over the last two days.
"Things are moving and changing at a rapid pace", Douglas County Commissioner Mary Ann Borgeson said Friday at a news conference. Blizzard and avalanche warnings have been issued across Colorado. Some 85,000 people, mostly in the Denver area, were still without electricity Thursday. Parts of South Dakota have already gotten 15 inches of snow. 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. Residents were being urged to stay off the roads during the duration of the storm, CBS Denver reported.
Some drivers have been waiting hours to be rescued from roadways in central Colorado.
"We do know that here is a link between the warming Arctic and the weather patterns in the mid-latitudes", she said. "But we were soaking wet already just from trying to keep the windshield clear and from trying to push our vehicle and help other people push their cars. We have a pregnant woman", she said earlier Thursday.
As millions of Americans feel the brunt of a powerful, late season storm, climate experts said the sudden blizzard was no fluke, but a sign of things to come. He left at noon and tried to take back roads but found them blocked by disabled cars.