Port Washington Weather Forecast, WI (53074) Tornado History Port Washington-area historical tornado activity is near Wisconsin state average. It is 20% greater than the overall U.S. average. On 8/22/1964, a category 4 (max. wind speeds 207-260 mph) tornado 2.8 miles away from the Port Washington city center injured 30 people and caused between $500,000 and $5,000,000 in damages. On 4/4/1981, a category 4 tornado 22.1 miles away from the city center killed 3 people and injured 53 people and caused between $5,000,000 and $50,000,000 in damages.