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A study of squalls at Madras Airport

A statistical study of the frequency of squalls at Madras Airport and the changes in, the ground weather conditions associated with them has been made, using the data for the years 1959-1979 (except 1972, 1973). The study indicates that the squalls at Madras Airport predominantly occur, during the summer half of the year (April-October) from the northwest quadrant in southwest monsoon months and from northeast quadrant in the retreating monsoon season, with an average temperature drop of 2.5 deg. C associated with them. The comparison of the upper wind data shows that the squall directions are best correlated with the directions of the wind at 700 mb and also with the mean wind in the 850 to 500 fib layer.