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 wrap farther around the center on the eastern side of the storm while showing signs of increased banding and curvature, a sure sign that Joaquin's circulation was intensifying. GPM shows a large area of very intense rain with rain rates ranging from around 50 to 132 mm/hr (~2 to 5 inches, shown in shades of red) just to the right of the center. This is a strong indication that large amounts of heat are being released into the storm's center, fueling its circulation and providing the means for its intensification. Associated with the area of intense rain is an area of tall convective towers, known as a convective burst, with tops reaching up to 16.3 km. These towers, when located near the storm's core, are a strong indication that the storm is poised to strengthen, as they also reveal the release of heat into the storm.
Joaquin became a hurricane on September 30, 2015, at 8:00 am EDT.
Visualizers: Kel Elkins (lead), Alex Kekesi (lead)
For more information or to download this public domain video, go to https://svs.gsfc.nasa.gov/4367#22583.