National Weather Service, Nashville
While the months of March, April & May are traditionally regarded as tornado season in Middle Tennessee, when we experience nearly two-thirds of our tornadoes, tomorrow, May 18, is actually our cutoff date for outbreaks of large tornadoes. Our tornado database shows that during the past 50 years, we have not experienced a severe weather outbreak that produced EF-2 or greater tornadoes after May 18. (The outbreak of May 18, 1995 was the latest such outbreak we have experienced in recent decades.) Of course, we can have severe weather after May 18. Severe storms occur in all parts of the year. And we can even experience large tornadoes, but they are extremely rare after May 18. So we are about to enter that part of the year when the ingredients needed for major outbreaks of severe storms that include large tornadoes have great difficulty materializing.