The majority of tornadoes occur in agricultural areas. Tornadoes need
moisture to feed their parent thunderstorms and the instability
associated with spring and summer warming. Crops need moisture to grow
and the temperature variation associated with changing seasons. Both
conditions for tornadoes and agricultural growth are found in the same
areas, as is shown on this map. (Courtesy of Dr. T. T. Fujita, University
of Chicago)
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