Bill developed from Tropical Depression Three in the eastern Atlantic southwest of the Cape Verde Islands.
Bill track on SST image of 20 August (319 Kb) This image
represents the average composite sea surface temperature (SST) derived from
NOAA satellite AVHRR data over the 3 days ending 19 August 2009. The
averaging is done to remove clouds. The temperature scale for SST is
22C to 32C. The track of Bill is overlaid on this image.