One of my scariest moments was on my first chase encounter with a tornado, in Evansville, IL on December 23 (yes, December, no typo!), 1996. I was tracking a large, partly rain-wrapped lowering, associated with an HP supercell embedded in a squall line, and got confused about directions. And the road I was on, instead of crossing east just north of town, turned and went into the town. Then I got into golfball hail. After the road wound around, I was thoroughly confused about direction, and ended up going east when I thought I was going south. Suddenly the hail stopped and it was brighter to my right. My impulse was turn right into the clearer area, but fortunately I knew just enough to realize that I could have crossed to the inside of the bear's cage, and there might be a tornado there to my right. So I kept going, but was not really crossing ahead of the storm by going south as I thought, but staying barely ahead of it by going east. Eventually I cleared the worst of it, and when I came back, trees, power poles, and the remains of the town's bowling alley were in the road where I had considered turning right. I must have crossed through that area a minute or two - maybe less - before the tornado did. Full account of this chase on my old Web pages at:
http://www.siue.edu/~jfarley/chased23.htm
Another scary moment, also involving 1) an HP supercell and 2) my failure to have my escape options as well figured out as I should have, was on April 13, 1998. In the end the escape route I had worked out OK, but I did not plan for the northwestward jog on I-255 as I tried to reposition from Pontoon Beach, IL to east of Edwardsville to get back ahead of the northeastward moving storm - that north then east move that Mike mentions above - and ended up getting pounded in the bear's cage, knowing there could be a tornado just to my WSW but not being able to see it. I drove way too fast for conditions as the
escape instinct took over, and eventually did clear the wrapping rain - but then being on the freeway, got at best a brief glimpse of the tornado that hit Edwardsville less a mile from my house. By the time I got to where I could stop, the wide, truncated funnel I had briefly glimpsed (and wasn't even sure at the time that it
was a funnel) was again hidden in the rain. Fear and frustration wrapped up in one chase. The one lesson I took from both of these chases is to always have an escape route that you know exactly - and don't lose track of what direction you're going. Of course, since my last couple cars have had compasses in the mirror, that part is easier now.