November has been unusually active for tornadoes in the United States. Ordinarily, tornado activity is most pronounced from mid-spring to the beginning of summer. Last December brought unprecedented tornado activity for the time of year. Nov. 4 was just the third day since 2014 to see multiple EF4 or EF5 twisters. Outbreak across the South on Nov. 29 and 30 produced two EF3 tornadoes. The heightened March activity over the past few years could be related to La Niña.
