A sprawling storm system crossing the U.S. overturns semitrucks on highways and fans wildfires in Texas, Oklahoma, Missouri and Kansas. Tornadoes might hit the South.

A cross-country storm is strengthening as it moves over the central United States Friday and pounding the region with damaging hurricane-force wind gusts that are creating a blinding dust storm and fanning flames amid a “catastrophic” fire risk.

The National Weather Service on Friday warned that potentially strong tornadoes may develop on Saturday over the lower to middle Mississippi and Tennessee valleys. Lightning, wind gusts of at least 74 mph and hail of at least two inches will accompany the outbreak over parts of the valleys and Southeast through Sunday.

A multi-day tornado threat is unfolding across several U.S. states, with severe storms capable of producing damaging winds, large hail, and tornadoes. Meteorologist Rhythm Reet from The Weather Network breaks down the details.