Did you know that there is a “mirror season” for tornadoes in the U. S.? Because of the temperature changes in the fall in the northern hemisphere, fall weather conditions mirror, to some extent, the conditions that exist in the spring and can spawn “swarms” of tornadoes. This is an El Nino year, which will affect all of the U.S., but especially the southern and Gulf Coast regions of the U.S. (look out Florida, Alabama, Mississippi, Louisiana and Texas!), bringing a wetter and somewhat cooler winter, according to the National Oceanic and Atmospheric Administration (NOAA).
Click here to see the NOAA page with lots of enlightening info. The positive aspects of an El Nino year include increased moisture for drought-stricken areas as well as a dampening effect on hurricane activity during summer and fall, but an increased chance for “organized” tornado activity in the fall goes hand-in-hand. See the maps below from the NOAA site mentioned above for their forecast of both temperature and precipitation for the U.S. this winter. So, especially for those in the southeast tier of U.S. states, brush off those shelter-in-place plans for your institutions’ buildings and think about preparedness at home, just in case!