REED TIMMER HAS been chasing storms for more than two decades, since he intercepted his first tornado in northern Oklahoma as an undergrad majoring in meteorology. During that time, Timmer, who typically logs more than 50,000 miles on the road each year, has intercepted countless tornadoes, each one helping to further his extreme-weather knowledge. “We still don’t completely know what happens inside a tornado,” says Edgar ONeal, a weather journalist who is Timmer’s chase partner. ¶ Enter the Dominator. This is the third iteration of Timmer’s custom-built tornado mobile, which he initially rolled out in the late 2000s. The current Dominator has the chassis of an F350 and weighs 10,000 pounds, enabling it to withstand the debris, gorilla hail, and 150-mph winds that accompany the most powerful of storms. According…