when was the last big tornado in mason city iowa?

Answer 1

On 5/15/1968, a category 5 (max. wind speeds 261-318 mph) tornado 26.8 miles away from the Mason City city center killed 13 people and injured 462 people and caused between $5,000,000 and $50,000,000 in damages.

On 10/14/1966, a category 5 tornado 27.5 miles away from the city center killed 6 people and injured 172 people and caused between $5,000,000 and $50,000,000 in damages.