world, agricultural areas (e.g., the midwestern United States
and farming regions within other countries like Brazil and
Argentina) tend to be at higher risk for the development of
tornadoes because certain weather patterns that promote good
crop yields may also contribute to the development of tornadoes
(10). In addition to geographic factors, the time of day and the
time of year also affect a population's risk from tornadoes. For
example, late afternoon is the time of day when tornadoes are
most likely to occur. Seasonal variation associated with the
development of tornadoes means that the risk from tornadoes to
the population at any given location is not constant throughout
the year. In the United States, January is the month when the
fewest tornadoes occur, and May is the month when the most
tornadoes occur (10). Other natural factors that promote the
development of tornadoes include weather phenomena such as
hurricanes. Hurricane Beulah, for example, which struck in 1967,
is credited with spawning 115 to