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Role of atmospheric phenomena in monsoon: (1) Temperature & insolation variouslz affect both intensity & distribution. (2) Presence of local cyconic system affects intensity [ex] Kalbaisakhi in wetbengal. However - Apart from atmospheric & oceanic factor: > Topography plays a role in monsoon arrival, distribution [ex] Rainhadow region behind Western Ghats. > climate change impacts monsoon as cited by IPEC report. > Pollution & other local factor in distribution of monsoon spread. IMD plays a crucial role in predicting & warning about any variation from set patterns of monsoon spread & intensity