Do folk who backpack in Tornado areas carry a weather radio and if you get very bad forecast would you try to get back to your car or hunker down somewhere (if that's possible)
short answer ..... not this one
1) the frequency of severe weather forecasts is not high
2) many are tornado watch forecasts and a majority of them are much ado about nothing
3) the area damaged by tornadoes is relatively small (I'm in the northern midwest, that is not always true 800 miles south of here)
4) tornado warnings are quite time & location specific (which would be useful) but tornadoes move fast by trail walking/running standards, it'll be over before you reach the car
In May 2011 there was a tornado "near" where we were backpacking on the SHT. Scared the dickens out of folks back home. But "near" was about 30 miles away and we were blissfully unaware. The same storm system DID catch me on a ridge top overlooking Lake Superior. The hail was "unpleasant", the lightning ground strikes somewhat beyond unpleasant. 30 minutes earlier it had been sunny. Radio weather forecasts are rarely specific enough to guide trail tactics for avoiding that sort of thing. Strategy? Sure, stay home unless the forecast is perfect. It's up to you to decide if that is acceptable.