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Understanding Local Variations in Hazard Levels
Tornado and Hailstorm
Tornado and Hailstorm Losses
Tornadoes typically result from high-level, cold, dry air flowing
over a region that already contains warm and humid air. In the
northern hemisphere, this is most common on the east side of
mountain ranges. While tornados can occur east of the
Appalachians, between the Cascades and the Rockies, and east of
the Urals in Russia, most of the tornados in the world are east of
the Rocky Mountains and north of the Gulf of Mexico. The peak
exposure area is a triangle running from Saskatchewan to Texas
and east to the Ohio river valley.
The following pages are an overview of experience in a few states,
showing variations between and within states.
Tornado and Hailstorm
State Experience
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