Late in the program, a storm chaser explained the El Reno OK tornado on May 31, 2013, which killed a storm chaser because it went in an unusual direction (to the SE), and exploded from a half mile wide to 2-1/2 miles in 30 seconds, with 296 mph winds at one point. Fortunately, most of that was over unpopulated areas, but people were killed driving on I-40.
I can remember being caught in severe weather when driving a few times. I saw a small tornado from Rt 9 (crossing it) driving west from Rehoboth Beach in August, 2001; it missed me by a half mile. In April 2005, on a Saturday morning, I was caught by a severe storm on I-95 driving south of Ocoquan; it had been cool and cloudy when I left Arlington. A tornado was reported near Richmond from that storm. In August of 2012, I was caught in a prolonged frightening night storm in northeastern Maryland to the Baltimore Harbor Tunnel; it disappeared south of Baltimore. NE Maryland gets the jackpot in my experience for exposure to severe weather. Then, just last Sunday morning (right after midnight), returning from Baltimore gay pride, and driving on 123 toward Glebe Road in Arlington to return, I missed being hit by a falling tree in good weather (weakened two days before) by about three minutes. I sent a tweet to WJLA on that one.