Where is Tropical Storm Dexter? Atlantic hurricane season is June 1 to Nov. 30, 2025, with most tropical storm activity between August and October.

Tropical Storm Dexter formed Sunday night. The system started as an area of interest late last week and it rapidly developed into a tropical storm with 45 mph wind speeds upon the first advisory issued at 11 p.

Tropical Storm Dexter formed Sunday night over the western Atlantic, far off the coast of North Carolina, according to forecasters who expect it to move away from the U.S. coast.