Sat, May 21, 2016, 04:40 PM
The formation of thick cumulonimbus clouds caused the sudden thunderstorm in Hyderbad last evening, said weather expert Raja Rao. Generally they gather at a certain point and cause heavy rain, within a limited radius. The winds coming from under the clouds, at a very high speed, cause the uprooting of trees and other structures, he said. The clouds are identified by their dark, mountain shaped appearance. People should avoid standing under trees or staying in weak buildings, at that time, he said.