Seneca-area historical tornado activity is near Pennsylvania state average. It is 11% smaller than the overall U.S. average. On 5/31/1985 , a category F5 ( max. wind speeds 261-318 mph) tornado 31.4 miles away from the Seneca place center killed 18 people and injured 310 people and caused between $50,000,000 and $500,000,000 in damages. More @Wikipedia
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