Evidence of the weak updrafts in the eyewall comes from the fact that the TRMM radar's reflectivity stayed under 40 dBZ, a commonly cited signal strength at which updrafts can be vigorous enough ...

This image of Amara combines TRMM satellite rainfall data and clouds from Japan's METEO-7 satellite on Dec. 19. Heaviest rain was southeast of the center at 1.6 inches per hour. Disclaimer ...