Although the number of days that there is a tornado in the U.S. is decreasing overall, the average annual number of tornadoes has remained roughly the same, according to the latest research.
Last week, more than 125 tornadoes were reported in the U.S. over a five-day period across states including Iowa, Missouri, Georgia and Mississippi – a continuation of a trend that shows more tornado outbreaks despite fewer tornado days, meaning days during which at least one tornado is reported, experts told ABC News.
The variability of tornado occurrences in the U.S. has increased over recent decades, in that there are now fewer days in which a tornado forms.
However, there are more tornadoes on those days, Harold Brooks, senior research scientist on the climatology of severe thunderstorms and tornadoes for the National Oceanic and Atmospheric Administration’s (NOAA) National Severe Storm Laboratory, told ABC News.
Because of this, the total number of tornadoes over the course of a year, on average, has remained unchanged, Brooks said.
Researchers describe the shift as “a decline in the number of tornado days per year” but an “incline in the number of tornado outbreaks,” Robert Trapp, professor of atmospheric sciences at the University of Illinois Urbana-Champaign and director of the School of Earth, Society and Environment, told ABC News.
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Author: Faith N
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