It's useful to the commerce and enterprises of the neighbouring cities that have not been affected by the tornado. The term "useful" is obviously relative, once the unique usefulness is that. However, nobody wants such usefulness.
The term "usefulness" must be changed here to "consequence". I can't imagine how a tornado or another similar event could be useful.
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Severe thunderstorms have the potential of producing a tornado with little or no advanced tornado warning.
I used to live in Tornado Alley... a tornado watch means that the weather conditions mean it is very likely that a tornado will form in an area. A tornado warning means a tornado has touched down nearby.
A tornado is also commonly known as a cyclone.
If you mean the longest lasting tornado, the duration was 3 hours and 29 minutes. This was the infamous Tri-State tornado of 1925. It also holds the record for longest damage path (219 miles), fastest forward speed (73 mph), and highest death toll (695) of any U.S. tornado.
Tornadoes are very dangerous. Properly preparing for a tornado will make you less likely to be injured or killed.