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16 Million in Plains States Threatened by Severe Storms Bringing Wet Snow, Heavy Rain

More than 16 million people were threatened by severe weather Sunday morning as snow continued and heavy rain was expected to trigger flash floods.

More than 16 million people were threatened by severe weather Sunday as heavy rainfall triggered flash floods in Texas, while the Plains and Colorado continued to deal with wet, heavy snow.

Parts of Colorado, northern New Mexico, Wyoming, western Nebraska and western South Dakota will see wet, heavy snow through Sunday night, said Michael Palmer, a lead meteorologist for The Weather Channel. The slushy snow, paired with heavy winds, could cause power failures and downed trees, Palmer said.

Related: Snow Socks Colorado, More Severe Weather Expected in Mid-Section of Country

Higher elevations in Colorado had accumulated up to 3 feet of snow by Sunday morning, while Denver picked up 8 to 12 inches, Palmer said.

More than 3 million people in the region remained under a winter storm warning Sunday.

Meanwhile, another 12 million people in the Plains were under flash flood warnings and watches or severe weather warnings tied to the possibility of severe storms. Palmer said a "copious" amount of rain would fall in the Plains, with the heaviest rain totally up to 8 inches in a stretch from Texas to western Nebraska.

Just this weekend, the average rainfall for April has been doubled in parts of the Plains, including Dodge City, Kansas, which got 4.58 inches of rain Saturday into early Sunday. Roads were already being washed out Sunday by flooding in Ellis County, Kansas.

Texas and Oklahoma were also facing the threat of tornadoes and large hail along with the downpours, said Ari Sarsalari, a meteorologist for The Weather Channel.

Almost 500 arrivals and departures were canceled Sunday at Dallas-Fort Worth International Airport, and more than 600 others were delayed, the airport reported. Texas Gov. Greg Abbott put the State Operations Center on high alert Sunday.

"It's going to really add up to a lot," Sarsalari said. "Flooding's going to be a big concern over the next couple of days" from Houston up through Dallas into Oklahoma, he added.