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Super Typhoon Hinnamnor once again reaches Category 5 intensity

By Scott Bachmeier •

JMA Himawari-8 Visible (0.64 µm) images [click to play animated GIF | MP4]

2.5-minute rapid scan JMA Himawari-8 Visible (0.64 µm) images (above) showed rapidly-intensifying Typhoon Hinnamnor as it once again reached Category 5 intensity (ADT | AiDT | SATCON) about 3 hours after local sunrise on 31 August 2022. Mesovortices rotating within the eye were evident though breaks in patchy high clouds overhead.

2.5-minute Himawari-8 Infrared (10.4 µm) images (below) revealed convection within the eyewall region which exhibited cloud-top infrared brightness temperatures of -80°C and colder (violet pixels).

JMA Himawari-8 Infrared (10.4 µm) images [click to play animated GIF | MP4]

Several hours before sunrise, a toggle between NOAA-20 VIIRS Day/Night Band (0.7 µm) and Infrared Window (11.45 µm) images valid at 1749 UTC, viewed using RealEarth (below) revealed concentric mesospheric airglow waves in the DNB image, propagating away from Hinnamnor (primarily to the north of the storm).

NOAA-20 VIIRS Day/Night Band (0.7 µm) and Infrared Window (11.45 µm) images, valid at 1749 UTC [click to enlarge]

The mesospheric airglow waves were less evident in an earlier comparison of Suomi-NPP VIIRS Day/Night Band and Infrared Window images, valid at 1700 UTC (below) — however, at that time the DNB displayed bright streaks near the eye, indicative of clouds illuminated intense lightning activity.

Suomi-NPP VIIRS Day/Night Band (0.7 µm) and Infrared Window (11.45 µm) images, valid at 1700 UTC [click to enlarge]

Categories: Himawari-8, Lightning, NOAA-20, RealEarth, Suomi NPP, Tropical cyclones, VIIRS