The tropical cyclone formation probability (TCFP) is determined by NCEP global forecasts, Reynolds weekly sea surface temperature, and GOES-East, GOES-West, MTSAT-1R and Meteosat-7 channel-3 (water vapor) imagery. These data points are used as input to an algorithm and then calculates an estimate of the probability for possible tropical cyclone formation within 500km of each grid point within the next 48 hours.