(Wunderground) The outer spiral bands of Super Typhoon Neoguri are pounding the Japanese Ryukyu Islands, which include Okinawa, as the mighty storm heads north-northwest at 12 mph towards Japan.
At 11:30 pm local time (13:30 UTC) Monday, Naha City in southern Okinawa was reporting heavy rain and wind gusts of 43 mph. At 8 pm local time Monday, Miyako-jima reported sustained winds of 33 mph, gusting to 53 mph. On Sunday, Neoguri strengthened to 155 mph winds, crossing the 150 mph threshold needed to be labeled a Super Typhoon.
As of 8 am EDT on Monday, the typhoon had weaker slightly to 150 mph winds, and infrared satellite images showed a reduction in the intensity and areal coverage of Neoguri's heavy thunderstorms.
Recent microwave satellite images showed that the weakening may be due to the onset of an eyewall replacement cycle, a common occurrence in intense tropical cyclones. In an eyewall replacement cycle, the inner eyewall shrinks to the point of instability, collapses, and is replaced by a larger-diameter outer eyewall that forms from a spiral band. This process can take several days, and typically reduces the peak winds by 10 - 20 mph.
With wind shear light, 5 - 10 knots, sea surface temperatures a very warm 30 - 31°C, and very warm waters extending to great depth along the storm's path, the typhoon will have the opportunity to re-strengthen once the eyewall replacement cycle is done.