Bill became the first hurricane of the 2009 Atlantic hurricane season on August 17. It reached Category 4 strength, but fortunately for East Coast residents, the storm stayed away from shore.
This pair of images from August 22 shows a natural-color (photo-like) view of Hurricane Bill captured by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite combined with a view of the vertical structure of the clouds measured by the radar on the Cloudsat satellite.
The first full-disk thermal image from the newest NASA/NOAA weather satellite shows the remnants of Tropical Storm Claudette and Tropical Depression Ana, as well as Hurricane Bill on August 17, 2009.
With a well-formed eye and a symmetrical shape, Hurricane Bill looked the part of the major hurricane it was forecast to become when this photo-like image was taken on August 18, 2009.
TRMM reveals that although Bill did not yet have an eye or eyewall, it did have a well-developed cyclonic circulation as evidenced by the curvature in the rain bands that spiral in towards the center.