Fog forecasting over Calcutta and neighbourhood

Effect of temperature, dew-point temperature, wind and synoptic situation on the formation of fog at Calcutta (Alipore) during winter months have been studied and prediction diagrams for temperature and dew-point as well as fog have been prepared. It has been concluded that successful fog prediction is possible on the basis of forecast of dew-point which is likely to prevail during late night hours particularly during the minimum temperature epoch and that such accurate dew-point forecast is only possible by watching hourly variation of dew-point till 2200 IST.