Time: The average number tornado outbreaks that bring multiple twisters from a single weather event is on the rise in the U.S., according to new research, and the findings could change the way insurers and disaster preparedness officials respond to tornadoes.
The study, published in the journal Nature Communications, also shows an increased variability in the number of tornadoes from one outbreak to another. Higher variability means that large outbreaks that result in multiple tornadoes can be more...