On the techniques of forecasting fog/stratus over The Dundigal airfield of Hyderabad

Abstract

In this paper a new technique named 'Technique of Elimination' has been introduced  for the forecasting of fog/stratus which utilizes the criterion of condition necessary to be satisfied by relative humidity during night prior to the formation of fog/stratus. Taylor's technique of ‘fog prediction diagram' has been modified by including the incidence of stratus also and it has been shown that it is feasible to give a forecast of fog/stratus as early as 1730 IST of the previous day in the months of November and December. Tendency of wet bulb depression at midnight has been computed and it has been shown that fog/stratus formed on most of the occasions when the interval of time so guessed fell within the normal hour of minimum temperature; Synoptic situations favourable for the formation of fog/ stratus at Dundigal have also been studied.