Sean formed between Bermuda and the Bahamas as a subtropical storm and continued to strengthen to gain tropical storm status Tuesday.
“What's interesting about this storm is that it started out as non-tropical and then took on tropical characteristics,” says Brian Owsiak, a meteorologist at The Weather Network. “It's south enough, and because the ocean water is warm, the warm atmosphere near the centre of the storm allows it to take on tropical characteristics.”
After remaining fairly stationary for several days, Sean picked up steam as it tracked towards Bermuda. As a result, a tropical storm warning was issued for the island. Up to 80 mm of rain is expected to soak the area over the next couple of days.
Large swells generated by Sean began affecting portions of the southeastern coast of the U.S. and Bermuda Friday. Officials say these swells could cause life-threatening surf and rip currents.
Moisture from Tropical Storm Sean will also contribute to a soggy Remembrance Day across the Maritimes.
The Atlantic hurricane season which picks up in June, usually remains active until the end of November.
With files from Kimberly Lamontagne