Abstract
THE south-west monsoon advances in most years from the south-east Arabian Sea first towards Malabar and then gradually northwards along the west coast of the Indian Peninsula with a clear discontinuous boundary, the monsoon air being relatively cool, moist, and highly unstable, and the air on the other side hot, dry, and less unstable. It has been known to move northwards in some years with a wellmarked ‘depression’ in front, a few hundred miles in diameter, and cause a burst of the monsoon on the west coast, but it was never recognised that innumerable little whirls, 20-30 miles in diameter, formed on the discontinuous boundaries, and passed undetected, except those which left their traces in the Colaba autographic records. Even at Colaba they were unknown until two very typical vortices passed through Bombay on June 17, 1927, and forced attention to their existence. A search was made of the past records, and several others were discovered to have passed through Bombay in previous years. They were looked for during the burst of this year's monsoon, and a feeble one was noticed passing through Bombay shortly after midnight on June 11.
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BANERJI, S. Vortices on the Monsoon Front. Nature 122, 841 (1928). https://doi.org/10.1038/122841a0
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DOI: https://doi.org/10.1038/122841a0
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