GPM observes tropical storm Joaquin
The GPM satellite captured Joaquin (which was a tropical storm at the time) on September 29, 2015, at 21:39 UTC as the hurricane moved slowly west-southwest about 400 miles east of the Bahamas.
At the time, Joaquin had been battling northerly wind shear, which was impeding the storm's ability to strengthen. However, compared to earlier in the day, the system was beginning to gain the upper hand as the shear began to relax its grip.
At the time this data was collected, Joaquin's low-level center of circulation was located further within the cloud shield, and the rain area was beginning to...