I just realised this was an old post bumped by soda, but I still would like PF to expand his maps of the coverage area for "tornado alley"...e.g., we have twisters all thru west & middle TN too often for my comfort...not so much east TN (where a certain Pixie I know lives), but even there it's not impossible...
PF, for a good idea of the total reach of the alley, check out the touchdown sites for the massive outbreak of April 1974, which wiped Xenia, OH off the map, literally...we had touchdowns & comparatively minor damage 5 miles from my house...

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