Tracks of North Atlantic tropical cyclones
An Atlantic hurricane or tropical storm is a
tropical cyclone that forms in the
Atlantic Ocean, usually in the summer or fall. A hurricane differs from a
typhoon only on the basis of location.
 A hurricane is a
storm that occurs in the
Atlantic Ocean and northeastern
Pacific Ocean, a
typhoon occurs in the northwestern Pacific Ocean, and a
cyclone occurs in the south Pacific or
Tropical cyclones can be categorized by intensity. Tropical storms have one-minute maximum sustained winds of at least 39 mph (34 knots, 17 m/s, 63 km/h), while hurricanes have one-minute maximum sustained winds exceeding 74 mph (64 knots, 33 m/s, 119 km/h).
 Most North Atlantic
tropical storms and hurricanes form between June 1 and November 30.
National Hurricane Center monitors the basin and issues reports, watches, and warnings about
tropical weather systems for the North Atlantic Basin as one of the Regional Specialized Meteorological Centers for
tropical cyclones, as defined by the
World Meteorological Organization.
In recent times, tropical disturbances that reach tropical storm intensity are named from a
predetermined list. Hurricanes that result in significant damage or casualties may
have their names retired from the list at the request of the affected nations in order to prevent confusion should a subsequent storm be given the same name.
 On average, in the North Atlantic basin (from 1966 to 2009) 11.3 named storms occur each season, with an average of 6.2 becoming hurricanes and 2.3 becoming major hurricanes (
Category 3 or greater).
climatological peak of activity is around September 11 each season.
In March 2004,
Catarina was the first hurricane-intensity tropical cyclone ever recorded in the Southern Atlantic Ocean. Since 2011, the
Brazilian Navy Hydrographic Center has started to use the same scale of the North Atlantic Ocean for tropical cyclones in the South Atlantic Ocean and assign names to those which reach 35 kn (65 km/h; 40 mph).