
Tornado season is ramping up in the United States.
As cool, dry air from Canada collides with warm, moist air from the Gulf, it creates ideal conditions for tornadoes. Recently, the National Weather Service issued an unusually far-in-advance alert, covering a wide swath of the Midwest and the South, from Cincinnati, Ohio, to Birmingham, Alabama. The Storm Prediction Center warned of a “moist warm sector” that could suggest “severe storms including supercells, and attendant, all-hazards severe potential.”
A tornado that hits a populated area can cause damage in the billions of dollars and cause fatalities. Here are six of the costliest U.S. tornadoes.