![\"GOES-17](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2021\/07\/210719_goes17_visible_shortwaveInfrared_infraredWindow_fireTemperatureRGB_Dixie_Fire_CA_anim.gif\")
<\/a>GOES-17 \u201cRed\u201d Visible (0.64<\/em> \u00b5m, top left),<\/em>\u00a0Shortwave Infrared (3.9<\/em> \u00b5m, top right)<\/em>, \u201cClean\u201d Infrared Window (10.35<\/em> \u00b5m, bottom left)<\/em>, and Fire Temperature RGB (bottom right)<\/em>\u00a0[click to play animation | MP4<\/strong><\/a>]<\/p><\/div>5-minute GOES-17 (GOES-West)<\/em>\u00a0\u201cRed\u201d Visible (0.64 \u00b5m<\/strong><\/a>), Shortwave Infrared (3.9 \u00b5m<\/strong><\/a>), \u201cClean\u201d Infrared Window (10.35 \u00b5m<\/a><\/strong>) and\u00a0Fire Temperature RGB<\/strong><\/a>\u00a0images\u00a0(above)<\/strong><\/em> revealed that the\u00a0Dixie Fire<\/strong><\/a> in northern California produced a pair of pyrocumulonimbus<\/strong><\/a> (pyroCb) clouds \u2014 denoted by cloud-top 10.35 \u00b5m infrared brightness temperatures of -40\u00baC or colder (shades of blue pixels) \u2014 late in the day on 19 July 2021<\/a><\/strong>. The first pyroCb formed at 2241 UTC, with the second at 2331 UTC, Maximum surface 3.9 \u00b5m brightness temperature sensed with this fire was 138.7\u00baC \u2014 which is the saturation temperature for the ABI<\/strong><\/a> Band 7 detectors.<\/p>\n GOES-17 Day Land Cloud Fire RGB<\/strong><\/a> images (below)<\/strong><\/em> include plots of GLM<\/strong><\/a> Flash Extent Density and contours of ProbSevere LightnngCast<\/strong><\/a> probability — and show that LightningCast probability exceeded 50% as early as 2241 UTC<\/strong><\/a> (the time of the initial pyroCb formation), with the first GLM lightning being detected 40 minutes later at 2321 UTC<\/strong><\/a>. LightCast probability first exceeded 75% at 2341 UTC<\/strong> <\/a> — with GLM Flash Extent Density increasing in coverage and intensity 30 minutes later after 0011 UTC (associated with the second pyroCb anvil as it drifted north-northeastward).<\/p>\n