Refer to figure.

TROPICAL REVOLVING STORMS (TRS). Are thermal depressions that develop over warm tropical oceans (wind speeds in excess of 33 kts). When they sustain wind speeds greater than 63 kt, they are designated tropical cyclones. TRS generate their power and energy from the release of large amounts of latent heat from moisture they have gained over the warm seas.

Tropical revolving storms only form in certain conditions:

• Must be within 5 and 25 latitude (Below 5º, Coriolis force is too small, above 25º latitude the sea is usually too cold)
• Ocean temperatures must be greater than 26°C. The higher the ocean temperature the greater the pressure drop within the core => This is the reason why we do not usually have TRS forming in the southern Atlantic because the sea surface temperatures are too low.
• Sufficiently unstable atmosphere at low level (so convective clouds penetrate the Trade wind inversion).

“India, Arabic Sea, Atlantic Ocean at 2°S” and “Caribbean Sea, Indian Ocean at 20°S, Pacific Ocean at 2°N” Incorrect. TRS only occur between 5 - 25º of latitude
“Australia, Gulf of Bengal, Atlantic Ocean at 20°S” Incorrect. Due to low sea surface temperatures, TRS do not form over the Southern Atlantic Ocean.