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Typhoon Bualoi in the West Pacific Ocean

By Scott Bachmeier •

JMA Himawari-8

Himawari-8 “Clean” Infrared Window (10.4 µm) images [click to play animation | MP4]

2.5-minute rapid scan JMA Himawari-8 “Clean” Infrared Window (10.4 µm) images (above) displayed Category 4 Typhoon Bualoi west of the Mariana Islands in the West Pacific Ocean on 22 October 2019. Note the rapid clearing and expansion of the eye after 04 UTC, as the tropical cyclone continued its trend of intensification (ADT | SATCON) while moving over water possessing high values of Sea Surface Temperature and Ocean Heat Content.

Himawari-8 “Red” Visible (0.64 µm) and Infrared images during that period when the eye rapidly cleared are shown below; the visible images eventually revealed mesovortices within the eye.

Himawari-8

Himawari-8 “Red” Visible (0.64 µm, left) and “Clean” Infrared Window (10.4 µm, right) images [click to play animation | MP4]

In a toggle between NOAA-20 VIIRS Day/Night Band (0.7 µm) and Infrared Window (11.45 µm) images at 1543 UTC (below), note the bright streak on DNB image from lightning activity in the eastern eyewall, along with moonlight side-illumination of some overshooting tops.

NOAA-20 VIIRS Day/Night Band (0.7 µm) and Infrared Window (11.45 µm) images (credit: William Straka, CIMSS) [click to enlarge]

NOAA-20 VIIRS Day/Night Band (0.7 µm) and Infrared Window (11.45 µm) images (credit: William Straka, CIMSS) [click to enlarge]

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