Two tropical cyclones called Irwin and Jova have developed in the eastern Pacific southwest of Mexico. The TRMM satellite traveled above tropical storm Jova on 7 October 2011 at 0413 UTC collecting data used in the images above. Jova is predicted to become a hurricane on the morning of 8 October and move northeastward toward the Mexican coast.

TRMM's Precipitation Radar (PR) data, shown above, reveals that Jova had a cluster of very powerful thunderstorms near the center of the intensifying storm. Some of these thunderstorms were reaching to heights of over 17 km (~10.6 miles).