Tornadoes while RVing

One thing I learned from my son who lives in OK is that MOST tornadoes move from the SW toward the NE. So either head due south or north. (not southwest or northeast). Remember the math problem in school where there were 2 trains going different speeds? I said I would never use that. Well I did. We were travelling east on I-10 and a tornado was moving toward I-10 from the south heading northeast. I calculated that if we continued on the same speed we would intersect with the tornado just as it crossed I-10. So we stopped for lunch and avoided the storm. Told my DH that I FINALLY used that math problem! LOL!!