Tornado season in the U.S. has been particularly destructive this year, with several devastating tornado outbreaks causing widespread damage across the country. The question on everyone’s mind is: what is driving these destructive storms?
According to Jana Houser, a tornado researcher at Ohio State University, tornadoes form within supercell thunderstorms that have a circulation pattern known as a mesocyclone. These thunderstorms require specific atmospheric conditions, including warm, moist air at the surface, cold, dry air above, and wind shear to create a rotating air column. As the updraft within the storm tightens and speeds up the rotation, a tornado can form.
While tornadoes can occur anywhere in the world under the right conditions, the U.S. experiences the highest number of tornadoes annually. This is due to the collision of air masses over the central part of the country, known as Tornado Alley. However, in recent years, a “new Tornado Alley” has emerged further east due to changes in the movement of moist Gulf air.
Tornadoes mainly form in the spring because it is a transitional season with a mix of cold air aloft and warm surface temperatures, creating instability in the atmosphere. As spring transitions into summer, tornado activity shifts northward, with different regions experiencing peak tornado activity at different times.
The current tornado season has been exceptionally active, with nearly 900 tornadoes reported by mid-May. This increased activity can be attributed to the meandering jet stream, which influences the paths of storms and the boundaries between air masses. High-energy systems moving through the region have been effective at producing severe weather when the right ingredients align.
In conclusion, the destructive tornado season in the U.S. can be attributed to a combination of atmospheric conditions, including specific ingredients within supercell thunderstorms and the influence of the jet stream. As the season continues, it is essential to stay informed and prepared for severe weather events.
