Very revealing recent microwave overpasses of #Nana. 37 GHz imagery shows the "Cyan Ring" signature that tends to be associated with rapid intensification. Deepest convection still a bit west of the center because of some E shear.https://t.co/D5RXTf7wt1https://t.co/hynC7Oin87 pic.twitter.com/rU3V1XbFvW

— Andy Hazelton (@AndyHazelton) September 2, 2020