North Atlantic (western tropical part):
- Mainly over Caribbean Sea and Gulf of Mexico and
- Maximum frequency is during August to October.
Indian Ocean:
- Bay of Bengal and Arabian Sea, with two maxima
- One in May and another in October-November.
South Indian Ocean:
- The area extending from Madagascar and Reunion islands up to 900 E longitude and Timor Sea in north-western Australia and
- Mainly during January to March.
North Pacific Ocean (eastern tropical part):
- Over western coastal areas of Mexico and Central America up to California coast and
- Maximum occurrence is during August to October.
North Pacific Ocean (western tropical part):
- This region has maximum occurrence of cyclones in the world with
- Maximum frequency in August and September and includes mainly,
- Philippines, China sea and areas around Japan.
South Pacific Ocean (western tropical part):
- East coast of Australia, in and around Samoa and Fiji Islands and around the Coral Sea region and
- Occur during January to March.
