At least 43 people have been killed over the past five days by severe storms across southern and western parts of the United States.
Flash floods, tornadoes and now snow have destroyed hundreds of homes and businesses and snarled transport links.
The National Weather Service has issued tornado warnings for Texas, Arkansas, Louisiana, Oklahoma and Mississippi.
The governors of Missouri, Oklahoma, and New Mexico have declared states of emergency.
In Illinois, three adults and two children were swept away in their car by the flood waters. In Texas, at least 11 people were killed by powerful tornadoes with winds of up to 200 miles an hour (300kph).