Spring is known for its strong storm systems that can create violent twisters. However, it’s not the only season known for tornadoes. Autumn is considered the “second” tornado season.
“The second half of October and especially November can often be a second season for tornadoes and severe thunderstorms,” said tornado expert Dr. Greg Forbes. “In many ways, this is the counterpart to spring, when strong fronts and upper-air systems march across the United States. When enough warm, moist air accompanies these weather systems, the unstable conditions yield severe thunderstorms and sometimes tornadoes.”
May is still the peak month for tornadoes. Up to 52 percent of September’s tornado outbreaks are due to landfalling tropical storms and hurricanes. October and November’s tornadoes are caused by strong cold fronts and low pressure systems affecting the South and sometimes the Midwest.