What causes Thunder Storms? Most severe Thunder Storms happen in America because of its giography of the United States east of the Rocky Mountians. There is the best spot for Thunder Storms to accure. The basic ingredients used to make a Thunder Storm is a warm, moist air mass and the humid tropical air that flows over the eastern and central United States from the Gulf of Mexico, the Caribbean, and the Alantic Ocean around Bermuda during the Spring and Summer are the perfect recipe for Thunder Storms. Any kind of Thunder Storm can generate gust of wind that can trigger additional Thunder Storms up to 100 miles away.