https://phys.org/news/2018-08-nasa-cold-storm-tops-circling.html

On Aug. 30 at 11 a.m. EDT (1500 UTC), NOAA's National Hurricane Center or NHC noted Norman had rapidly strengthened during the past 12 to 24 hours, with the development of a well-defined 20-nautical mile wide eye and a thick ring of cold cloud tops of minus 94 to minus 121 degrees Fahrenheit (minus 70 to minus 85 degrees Celsius) Storms with cloud top temperatures that cold have the capability to produce heavy rainfall.

The eye of Hurricane Norman was located near latitude 17.8 degrees north and longitude 118.0 degrees west. That's about 630 miles (1,015 km) west-southwest of the southern tip of Baja California, Mexico.