Himawari-9 “Red” Visible (0.64 µm, top), Shortwave Infrared (3.9 µm, middle) and “Clean” Infrared Window (10.4 µm, bottom) images [click to play animation | MP4]

10-minute JMA Himawari-9 “Red” Visible (0.64 µm), Shortwave Infrared (3.9 µm) and “Clean” Infrared Window (10.4 µm) images (above) showed the formation of 2 pyrocumulonimbus (pyroCb) clouds spawned by a wildfire in Sichuan province, China on 16 March 2024. The initial (smaller, shorter-lived) pyroCb developed at 0820 UTC — exhibiting a cloud-top 10.4 µm infrared brightness temperature of -40ºC and colder, denoted by the shades of blue — with the second (larger, longer-lived) pyroCb developing at 0910 UTC. The wildfire began to make a rapid northeastward run during the ~4 hour period shown in the animation. The fire environment across that region became more favorable as wind speeds increased with the approach of a deepening surface cyclone, as shown in surface analyses (the pyroCb-producing wildfire was located near 30º N latitude, 131º W  longitude).

Himawari-9 True Color RGB images created using Geo2Grid (below) showed the east-northeast transport of the smoke-tinged pyroCb cloud

JMA Himawari-9 True Color RGB images [click to play animated GIF | MP4]

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