[Texas, Oklahoma, Kansas, Iowa, and Illinois could all be hit by tornadoes]
A battle between searing heat from Mexico and a chilly blast from the Arctic threatens to hit the US with violent thunderstorms and a barrage of bulldozing twisters.
Tropical southern-hemisphere summer air will flood into Texas, Arizona, New Mexico and surrounding States through the coming days pushing temperatures to 105F (40C).
Bubbling heat will hold out under high pressure as the tail end of Hurricane Lee pulls Arctic air down the east coast, while a separate cold plunge hits the west.
The two air masses will collide, triggering deep atmospheric instability to unleash a barrage of “severe” thunderstorms and the risk of tornadoes.