It’s easy to forget that tornadoes, though not generally as destructive as hurricanes, are more frequent and can also cause severe damage. We got a stark reminder of this at the end of last week, when tornadoes and storms in Florida left 20 people dead and hundreds of homes and businesses damaged or destroyed. Each year about 1,000 tornadoes with wind speeds as high as 300 mph touch down in the U.S., according to I.I.I. research. Check out our tornado statistics.