The average tornado damage path is 5 miles. But they can be much longer or shorter. The longest recorded damage path was 219 miles. The shortest was 7 feet.

There are 12320 yards in 7 statute miles well a mile is 5280 feet so 7 miles would be 36960 feet. and 36960 divided by 3 (3 feet in a yard) the answer would be 12320 yards in 7 miles. your welcome.