At least 16 dead as monster tornadoes tear across US as further severe weather warnings issued

“The next best option for shelter is a small, windowless room or hallway on the lowest floor of a sturdy building,” the agency advised.

Missouri’s highway patrol issued a stark warning: “We urge residents to stay away from debris-filled areas, watch for downed power lines and follow regional emergency services for localised updates.”

The storm system has triggered multiple emergencies beyond the tornadoes.

In Oklahoma, evacuations were ordered as more than 130 fires were reported across the state.

Strong winds toppled several tractor-trailers on highways.

“This is terrible out here,” said truck driver Charles Daniel. “There’s a lot of sand and dirt in the air.”

Power outages have affected more than 300,000 homes and businesses across Texas, Oklahoma, Arkansas, Missouri, Illinois and Indiana.

Further north, blizzard warnings were issued for parts of western Minnesota and eastern South Dakota.

Snow accumulations of 3-6 inches were expected, with up to a foot possible in some areas.