https://phys.org/news/2018-08-nasa-miriam.html

AIRS saw coldest cloud top temperatures being pushed slightly east of center by light vertical wind shear. Those cloud top temperatures were as cold as minus 63 degrees Fahrenheit (minus 53 degrees Celsius). Storms with cloud top temperatures that cold have the capability to produce heavy rainfall. At the time of the Aqua satellite overpass, Miriam's cloud pattern and overall convective organization had improved from earlier in the day.

On Tuesday, August 28, 2018, the National Hurricane Center (NHC) noted that Miriam's cloud pattern had still not improved very much from Aug. 27. On Aug. 29, microwave data showed the low-level center still slightly displaced from the deep convection due to about 11.5 mph (10 knots/18.5 kph) of northwesterly wind shear.