An assessment on the changes in some biological and physical properties of Bay of Bengal because of tropical cyclone BULBUL (landfall on 9 November 2019) was studied using ocean color remote sensing technique. The attempt involved the use of the Moderate Resolution Imaging Spectro-radiometer (MODIS), the Visible and Infrared Imager/Radiometer Suite (VIIRS) of the Joint Polar Satellite System (JPSS) and the Suomi National Polar-orbiting Partnership (S-NPP) sensor data in mapping of the quick variation in the chlorophyll-a concentration and Sea Surface Temperature (SST) in the upper water body. The study revealed an upward trend in chlorophyll concentration and the maximum value was of 18.21 mgm on 15 November at 21°03’45”N and 86°58’45”E and the lowest temperature was 25.1°C on 11November near 21.2°N and 88.1°E and showed a slight increase in SST in the post cyclonic period. The study also revealed a linear relationship between the chlorophyll concentration and SST.