Tornadoes form when high heat and humidity combine with strong winds which rapidly change direction with height in the lowest few thousand feet above the earth's surface.
(Tornadoes; form; T:when high heat and humidity combine with strong winds) (high heat and humidity; combine; with strong winds) (strong winds; rapidly change; direction; L:in the lowest few thousand feet above the earth's surface)
Tornadoes high heat and humidity strong winds
form combine rapidly change
T:when high heat and humidity combine with strong winds
with strong winds
direction L:in the lowest few thousand feet above the earth's surface