At least eight people died in the United States over two days when tornadoes struck Oklahoma and southern Michigan on March 5 - 6, and the National Weather Service warns more severe weather is possible on Saturday, March 7.

A weather service team is expected to head out on the morning of March 7 to survey damage from a tornado-producing storm that ripped across a 50 mile stretch of southern Michigan on March 6, leaving four dead.

A swath of damage was reported across parts of Cass, Branch and St. Joseph counties, from Edwardsburg through Three Rivers and into Union City, the weather service reported. At least one large, “extremely dangerous” tornado was confirmed in Three Rivers, Michigan, based on preliminary reports from trained storm spotters, emergency officials and public videos, according to the weather service.

Later in the evening on March 6, a tornado struck a home north-northeast of Beggs, Oklahoma killing two people, reported Okmulgee County Sheriff Eddie Rice. It was the second pair of deaths reported in Oklahoma in a little over 24 hours.

At least 90 million people across the nation from Texas to New York are at some risk of severe weather on March 7 as a cold front moves through the eastern U.S., the weather service's Storm Prediction Center warned.