![](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2023\/07\/230705_goes18_dayLandCloudFireRGB_shortwaveInfrared_infraredWindow_nearInfraredVegetatonFirePower_BC_pyroCb_anim.gif\")
<\/a>GOES-18 Day Land Cloud Fire RGB (top left), Shortwave Infrared (3.9 \u00b5m, top right), \u201cClean\u201d Infrared Window (10.3 \u00b5m, bottom left) and Near-Infrared “Vegetation” (0.86 \u00b5m) + Fire Power derived product (bottom right) [click to play animated GIF | MP4<\/strong><\/a>]<\/p><\/div>\n GOES-18 (GOES-West)<\/em> Day Land Cloud Fire RGB<\/strong><\/a>, Shortwave Infrared (3.9 \u00b5m<\/strong><\/a>), \u201cClean\u201d Infrared Window (10.3 \u00b5m<\/strong><\/a>) and Near-Infrared “Vegetation” (0.86 \u00b5m<\/strong><\/a>) images with an overlay of the Fire Power derived product (a component of the GOES Fire Detection and Characterization Algorithm FDCA<\/strong><\/a>) (above)<\/strong><\/em> showed that the Hossitl Creek<\/strong><\/a> wildfire complex northeast of Fort Nelson (CYYE) — in far northeastern British Columbia (and far southwestern Northwest Territories) — produced a pair of pyrocumulonimbus<\/strong><\/a> (pyroCb) clouds on 05 July 2023<\/strong><\/a>. Strong northeasterly winds in the wake of a cold frontal passage likely played a role in the rapid flare-up of ongoing fires (and the subsequent pyroCb development).<\/p>\n The thermal signature of active wildfires along the southern perimeter of the complex was either partially or completely masked by clouds much of the time, but one fire did exhibit 3.9 \u00b5m brightness temperatures as hot as 76.1\u00baC and Fire Power values as high as 1550.7 MW (both occurring at 2010 UTC). The pyroCB clouds exhibited cloud-top 10.3 \u00b5m infrared brightness temperatures as cold as -54.54\u00baC at 0110 UTC — at that same time\/location, the CIMSS-derived CLAVR-x Cloud Top Temperature was -58.27\u00baC, with a corresponding Cloud Top Height of 40,266.81 feet (below)<\/strong><\/em>.<\/p>\n Cursor sampling of GOES-18 \u201cClean\u201d Infrared Window (10.3 \u00b5m) brightness temperature, CLAVR-x Cloud Top Temperature and CLAVR-x Cloud Top Height (bottom left image panel) [click to enlarge]<\/p><\/div>\n In GOES-18 True Color RGB images from the CSPP GeoSphere<\/strong><\/a> site (below)<\/strong><\/em>, shades of tan to light brown helped to identify the smoke-laden anvil of the pyroCb clouds as they merged and drifted southeastward across the British Columbia \/ Alberta border.<\/p>\n