Tornadoes and hailstorms occurred at a rate of about 20 percent above average during the middle of the week. In contrast, the phenomena occurred at a rate of roughly 20 percent below average on the weekend.The only obvious explanation is pollution, especially from auto exhausts, which is greater during the week.
Friday, December 30, 2011
Does Pollution Make Storms Worse?
National Geographic reports on a study of 15 years of North American storm data: