Himawari-8 Visible (0.64 µm), Shortwave Infrared (3.9 µm) and Longwave Infrared Window (10.4 µm) images (above) showed a wildfire burning in Russia on 25 May 2017 at 58.3N 106.2E. This fire reached a minimum brightness temperature around -40ºC around 8:30 UTC.
Himawari-8 0.64 µm Visible (top), 3.9 µm Shortwave Infrared (middle) and 10.4 µm Longwave Infrared Window (bottom) images [click to play animation]
Suomi NPP OMPS Aerosol Index images (courtesy of Colin Seftor) shows the transport of smoke on 25 May . This max AI was near the source of the pyroCb.
OMPS Aerosol Index image on 25 May
1-km resolution POES AVHRR images (below; courtesy of René Servranckx) showed pyroCb cloud-top IR brightness temperatures right before the major development of the pyroCb. The coldest brightness temperature was -49.5º C at 7:45 UTC.
POES AVHRR Visible (upper left), Shortwave Infrared (upper right), Infrared Window (lower left) and false-color RGB (lower right) images