The coral bleaching Alert System (CBAS), a service initiated from INCOIS since February 2011. This model uses the satellite derived Sea Surface Temperature (SST) in order to assess the thermal stress accumulated in the coral environs. This information yields in drawing the early signs of the intensity and spatial extents of coral bleaching. This methodology adopted from NOAA reef and tested for the earlier bleaching events of Indian coral environs. The service CBAS disseminated once in three days comprising the Hotspot, Degree of Heating Weeks and time series products.