https://phys.org/news/2018-09-suomi-npp-satellite-florence-major.html

On Sept. 5 at 1:06 a.m. EDT (0506 UTC) the Visible Infrared Imaging Radiometer Suite (VIIRS) instrument aboard NASA-NOAA's Suomi NPP satellite captured an infrared image of Hurricane Florence.

The Infrared image provided forecasters with temperature data that showed where the strongest storms were located within the hurricane. Coldest clouds tops and strongest storms were around the center of circulation and a thick band of thunderstorms wrapping around the northern quadrant where temperatures were as cold as or colder than minus 70 degrees Fahrenheit (minus 56.6 Celsius). NASA research has shown that storms with cloud top temperatures that cold can produce heavy rainfall.