WeatherWhys for October 30,2015 from accuweather.com

The Halloween Storm of 1991 is also known as the "Perfect Storm," which the best-selling book and Oscar-nominated movie were based on. The massive "Perfect Storm" exploded into existence when the remains of Hurricane Grace combined with a powerful non-tropical system. The notoriety of the storm then continued as it made a rare loop to the south, tracking over water that was warm enough for tropical development and was classified as an "unnamed hurricane" on Nov. 1.