Severe weather threatened to batter the Plains with large hail and possible tornadoes Saturday, as Colorado cleaned up from violent storms that caused floods and left a trail of damage.
In Denver, police warned residents to stay off the streets because overnight flooding and falling trees.
Showers and storms were forecast throughout the northern and central Plains, turning severe in the Dakotas, Nebraska and into parts of Minnesota and Iowa.
"Large hail, damaging winds and isolated tornadoes can be expected," said Weather Channel forecast Michael Palmer.
"Storms will blow through the Midwest and Ohio Valley Sunday," he added.
One tornado struck in Hawthorne, Nevada, Friday evening, the National Weather Service said. At least four homes and five businesses suffered severe damage,NBC affiliate KRNV reported. There were no reports of injuries.
Parts of Colorado, including Denver, Colorado Springs, and Boulder, experienced flooding after heavy rainfall on Friday.
In one Denver neighborhood, residents came outside to find 3-foot-deep piles of hail. The marbles of ice blanketed the street like snow, and crews used bucket-loaders to clear the road.
Meanwhile, communities in southwestern Arkansas and northwestern Louisiana were forced to evacuate Friday as a swelling river threatened to bring floods throughout the weekend.
The Red River, which runs through Texas, Oklahoma, Arkansas and Louisiana, had already risen to 35 feet in Shreveport, Louisiana, on Friday afternoon, which is five feet above flood stage, according to the National Weather Service.