NASA's TRMM spacecraft is used to understand Hurricane Katrina. TRMM observed this view of Hurricane Katrina just before the storm made landfall on August 25, 2005. The cloud cover is taken by TRMM's Visible and Infrared Scanner(VIRS) and the GOES spacecraft. The rain structure is taken by TRMM's Tropical Microwave Imager (TMI). It looks underneath of the storm's clouds to reveal the underlying rain structure. Blue represents areas with at least 0.25 inches of rain per hour. Green shows at least 0.5 inches of rain per hour. Yellow is at least 1.0 inches of rain and red is at least 2.0 inches of rain per hour.
Hurricane Katrina moves slowly toward Florida and dumps 6 to 10 inches of accumulated rainfall over the region. In this animation, the amount of rainfall can be seen through color. blue is 0.25 inches per hour. Green is 0.5 inches per hour. Yellow is 1 inch per hour and red is 2 or more inches per hour.