https://phys.org/news/2018-08-nasa-tropical-storm-john_1.html

On Aug. 10. Infrared data from NASA's Aqua satellite analyzed temperature data in the clouds of the former hurricane that showed warm cloud tops and little precipitation.

At 4:45 a.m. EDT (0845 UTC) the Moderate Resolution Imaging Spectroradiometer, or MODIS, instrument aboard NASA's Aqua satellite analyzed Tropical Storm John's cloud top temperatures in infrared light.