Before the end of August, four hurricanes had formed in the Atlantic, two of which attained major hurricane status. A major hurricane is a tropical cyclone with winds of at least ; a storm of this intensity would be classified as a Category 3 or greater on the Saffir-Simpson Hurricane Scale introduced in the 1970s. In contrast to the busy August, only three named storms developed in September—although three of the August hurricanes lasted into September. Hurricane Dog became the strongest hurricane of the season on September 6 with winds of ; its peak strength occurred over the open Atlantic Ocean, so it did not cause significant damage when it was at its strongest. It was among the most severe hurricanes on record in Antigua, where the hurricane struck early in its duration. Eight tropical storms or hurricanes formed in October, which is greater than in any other year.