The 20 storms this year, which includes an unnamed subtropical storm that formed in mid-January, ties 1933 for the 4th ...

Sometimes powerful storms develop prior to the start of the season, but traditionally that time period accounts for over 97% of tropical and subtropical cyclogenesis in the Atlantic Ocean.

Hurricanes and tropical storms can form at any time of year, but are most active when ocean waters are warmest in the Atlantic Basin, between June 1 and November 30. The climatological peak for ...