On 26 June there were a reported two pyroCb in Alberta just west of Lake Athabaska. The first was at 58.7 N 113 W formed around 19:15 UTC. The second was at 59.3 N 113.7 W formed around 21:15 UTC. GOES-15 detected the smoke plumes and pyroCb clouds, as well as the fire hot spot. Starting at 19:30 UTC on 26 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.Below is a magnified version of the loop above to clearly show the development of the pyroCbs. Also, using GOES-15 10.7 μm IR channel the cloud-top IR brightness temperature could be found. The animation below, starting at 19:30 UTC on 26 June, shows the brightness temperature of the first pyroCb reaching -53.5ºC (yellow color enhancement) around 21:15 UTC on 26 June. In addition, the loop shows the second pyroCb reaching -54.7ºC around 22:00 UTC (indicated by yellow/orange color enhancement).