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Where do hurricanes occur / form?            Hurricane Message Board




Hurricane and tropical cyclone formation basins
Where do hurricanes occur? Hurricanes or tropical cyclones form in seven distinct basins around the world. Some hurricane formation basins are much more active than others. Some tropical cyclone basins also have conditions in which tropical cyclones may occur longer during the year. Most tropical cyclones form from a disturbance in the monsoon trough. The north Atlantic basin is considerably different, as the majority of hurricanes form from easterly waves originating from Africa.

Hurricanes and typhoons only can form over large basins of warm water such as an ocean or sea. This is due to the fact that they need a large amount of energy which is supplied by the heat from the warm ocean waters evaporating into the atmosphere. Hurricanes also occur at least several degrees away from the equator. This is because the Coriolis force is too weak at the equator to generate spin for the hurricane to develop.

North Atlantic Ocean     Hurricane season: June 1 - November 30. The most active period runs from about mid August through the latter part of October. Locations that may be affected are the Caribbean, Bermuda, Central America including eastern Mexico, the eastern and Gulf coasts of the United States, and eastern Canada.

Eastern North Pacific Ocean     Hurricane season: May 15 - November 30. This is the second most active region for tropical cyclones in the world. These storms mostly move into the open eastern Pacific Ocean. They can also affect western Mexico and the southern Baja. Sometimes after developing they can move west and many days later affect Hawaii.

Northwest Pacific Ocean     Typhoon season: All year. This is the most active basin in the world. Most typhoons form between July through November. The tropical cyclones that form here can affect the Philippines, southeast Asia including China and Taiwan, and Japan.

Bay of Bengal / Arabian Sea     Severe Cyclonic storm season: April 1 - December 30. This basin has a double maximum because of the monsoon trough moving through at two different times of the year. Maximums occur from mid April through May and from mid September through mid December.

Southwest Pacific Ocean     Severe Tropical Cyclone Season: October 15 - May 1. These tropical cyclones may affect eastern Australia.

Southeast Indian Ocean     Severe Tropical Cyclone Season: October 15 - May. These tropical cyclones may affect northern and western Australia. This basin has a double maximum in mid January, and mid February through early March.

Southwest Indian Ocean     Tropical Cyclone Season: October 15 - May 15. These tropical cyclones may affect Madagascar and southeastern Africa. A double maximum occurs in mid January and mid February through early March.





Tropical Cyclone Formation Regions
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