Largest low pressure: Pressure must be lowered with greatest value and this low pressure area must be surrounded by areas of High Pressure.
Coriolis force: For a TRS to form, there should be adequate value of Coriolis force, as Coriolis force is minimum or negligible at equator, TRS does not form within 5 degrees latitude from the equator. As latitude increase Coriolis force increases and is maximum at poles.
Warm temperatures of ocean: An ocean temperature of 26.5°C is the minimum requirement for TRS formation. They are necessary to fuel the heat engine of the tropical cyclone.
Sufficient Depth: Warm ocean water must exist over a sufficient depth of at least 50 meter.
Relative humidity : High relative humidity should be present in the lower to middle levels of the troposphere. The required amount of humidity is about 50 to 60%.
Potentially unstable atmosphere: Potentially unstable is required For a TRS to form, If the air is unstable, then it will continue rising and the disturbance will grow. This is required to maintain convection for an extended period of time.
Limited vertical wind shear: For tropical cyclone formation vertical wind shear should be less than 10 m/s between the surface and the tropopause. Strong wind shear can blow the TRS apart.
