At NASA a 3-D image was created using GPM's radar (DPR Ku band) data. GPM's radar revealed that the extremely powerful storms rotating around the eye were reaching altitudes greater than 7.75 miles (12.5 km). The tallest thunderstorms were found by GPM's radar in a feeder band that was located to the southwest of Irma's eye. These extreme storms were reaching heights of over 10.0 miles (16.2 km).
GPM is a joint mission between NASA and the Japanese space agency JAXA.