Tropical Cyclones

Tropical Cyclones

Tropical Cyclones are a special type of thunderstorm system, characterized by a central low pressure, surrounded by rotating winds at high speeds, which circulate anti clockwise in the Northern hemisphere and clockwise in the Southern hemisphere.

Conditions for Cyclone Formation
A number of conditions have to be met before a cyclone can form. A cyclone cannot exist without these conditions, however a cyclone will not always form just because the conditions are favorable.
1. Warm ocean waters greater than or equal to 26.5oC with a depth of at least 50 m. These warm waters are the energy source for Tropical Cyclones.
2. An atmosphere that cools quickly with height so that it is unstable and enhances vertical motion and moist convection.
3. Low values of vertical wind shear. This occurs when the winds at all vertical levels through the troposphere are blowing at the same speed and in the same direction. This enables the energy to remain concentrated.
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