In the span of 9 hours, Colaba in the South Mumbai recorded 230mm of rain associated with strong winds leading to uprooting of many trees and causing structural damage. During the last 9 hours, Santacruz recorded 66 mm of rain.
Since the last many years the formation of convective clouds known as CB clouds is more common during monsoon season. Convective clouds are capable of giving strong winds when they start dissipating. As Mumbai is in the coastal area and moisture feed is continuously available from the Arabian sea that is why the dissipation and regeneration of clouds are taking place over the Mumbai area leading to these torrential showers.
We expect rain activities to start reducing over Mumbai and suburbs from tomorrow. There will be a significant relief from ongoing heavy to very heavy downpour from tomorrow over Mumbai and suburbs, as the rain belt will gradually shift towards Gujarat.
A cyclonic circulation is over South Gujarat and the adjoining area up to mid-tropospheric level and well-marked low-pressure area is over Odisha. A trough is extending or a wind shear zone is extending leading to intense weather activities over the west coast of the country including Mumbai and suburbs.
Such heavy downpour for Mumbai and suburbs is uncommon, Skymet had already warned about these heavy and torrential rains well in advance. There will be a significant decrease in the rain activities over Mumbai and suburbs after August 5th.