British Columbia wildfire produces a pyrocumulonimbus cloud
![](https://cimss.ssec.wisc.edu/satellite-blog/images/2023/05/bc_ir-20230520_043021.png)
GOES-18 “Clean” Infrared Window (10.3 µm) images [click to play animated GIF | MP4]
GOES-18 True Color RGB and Nighttime Microphysics RGB images from the CSPP GeoSphere site (below) showed the late-day pyroCb formation and its subsequent eastward motion after sunset.
VIIRS Infrared Window (11.45 µm) images from Suomi-NPP (valid at 0952 UTC) and NOAA-20 (valid at 1042 UTC) are shown below. Cloud-top infrared brightness temperatures were as cold as -63ºC in the NOAA-20 image (which is mislabeled as NPP).