On 23 June around 22:45 UTC a fire started in British Columbia near 58.8 N 133.2 W. This fire produced a pyroCb around 00:00 UTC on 24 June 2015. GOES-15 detected the smoke plume and pyroCb cloud, as well as the fire hot spot. Starting at 22:00 UTC on 23 June, the animation below shows visible (.63 μm) on the left and shortwave IR (3.9 μm) on the right (click image to play animation). In the shortwave IR images the red pixels indicate very hot IR brightness temperatures exhibited by the fire source region.
In addition, using GOES-15 10.7 μm IR channel the cloud-top IR brightness temperature could be found. The animation below starting at 22:00 UTC shows the brightness temperature of this pyroCb reaching -52.8 ºC (lime green color enhancement) around 02:00 UTC. From the Fort Nelson sounding this put the cloud top height at 10 km.