FAQs

What is a severe cyclonic storm?

A cyclonic storm that travels at 89-117kmph is categorised as a severe cyclonic storm. By comparison, Cyclone Amphan, which was a super cyclone, travelled at a speed of 220kmph, but made landfall as a very severe cyclonic storm, which is characterised by speeds of 118-164kmph

What is storm surge?

The difference between the actual n water level under the influence of a meteorological disturbance (storm tide) and the level, which would have been reached in the absence of the meteorological disturbance (astronomical tide). Storm surge results mainly from the shoreward movement of water under the action of wind stress.

Storm surge is expected to be about 1-2 meters n height above astronomical tide and is likely to inundate low lying areas of Mumbai, Thane and Raigad districts and 0.5-1 meter height above the astronomical tide likely to inundate low lying areas of Ratnagiri district during the time of landfall.

What is an astronomical tide?

Tides are long-period waves that move through the oceans in response to the forces exerted by the moon and sun. Tides originate in the oceans and progress toward the coastlines where they appear as the regular rise and fall of the sea surface.

What is cyclogenesis?

Development or strengthening of cyclonic circulation in the atmosphere (a low pressure system)

Why is sea surface temp important?

A tropical cyclone can be compared to a heat engine. The energy input is from warm water and humid air over tropical oceans. When the sea surface temperature is warmer than normal e.g: it is about 32 degree C in parts