(CNN)Severe weather, historic snowfall and flash flooding are forecast for the next few days in areas of the central United States, from the Rockies to the Mississippi River Valley.This storm system begins with its first threat over the Rockies, as intense bands of snowfall will dump feet of powder across Colorado and Wyoming.Dangerous travel conditions will exist across portions of interstates 25, 70, and 80 — so drivers are urged to use extreme caution.“Very difficult to impossible travel conditions expected across all of southeast Wyoming and the Nebraska panhandle,” the National Weather Service (NWS) office in Cheyenne, Wyoming, said Thursday. “Expect extended periods of whiteout conditions, low visibilities, and possible power outages.”
But that’s just one side of the system. The south and eastern sides of the system — which will be pulling in warm, moist air from the Gulf of Mexico — will be fueling several days of severe storms, with the possibility of tornadoes.
Nearly 20 million people will be under the threat for severe storms at some point Friday through Sunday across half a dozen states with damaging winds, large hail, and tornadoes.
In addition to all that, the cold front will eventually stall across the Southern Plains, resulting in heavy rain over much of the same region throughout the next couple of days which will lead to flooding.