40 dead as storms head east; fire risk remains in parts of U.S.
At least 37 people have died across seven states as powerful storm systems swept through the Midwest and the South.
Fierce Storms Kill at Least 24 as Tornadoes Batter the South and Midwest
A severe weather system spawned intense, long-duration tornadoes that struck parts of Arkansas, Mississippi and Missouri, leaving some communities in tatters.