NHC has determined that the coldest cloud top in #Delta last night was -97C (!!)
— Jack Sillin πΊπ¦ (@JackSillin) October 7, 2020
This is extremely unusual, and is a signal that the updrafts in delta's eyewall are extremely intense.
Thankfully, updraft intensity isn't the only factor working to determine a cyclone's strength. pic.twitter.com/sR7ja5by8E