![](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2022\/07\/220730_goes17_visible_fireTemperatureRGB_infraredWindow_cloudTopTemperature_McKinney_Fire_CA_anim.gif\")
<\/a>GOES-17 \u201cRed\u201d Visible (0.64 \u00b5m, top left), Fire Temperature RGB (top right), “Clean” Infrared Window (10.35 \u00b5m, bottom left) and Cloud Top Temperature derived product (bottom right) images [click to play animated GIF | MP4<\/strong><\/a>]<\/p><\/div>1-minute Mesoscale Domain Sector GOES-17 (GOES-West)<\/em> \u201cRed\u201d Visible (0.64 \u00b5m<\/strong><\/a>), Fire Temperature RGB<\/strong><\/a>, “Clean” Infrared Window (10.35 \u00b5m<\/strong><\/a>) and Cloud Top Temperature<\/strong><\/a> derived product images (above)<\/strong><\/em> showed that the rapidly-growing McKinney Fire<\/strong><\/a> in far northern California produced multiple (5 or 6) pulses of pyrocumulonimbus<\/strong><\/a> (pyroCb) clouds late in the day on 30 July 2022<\/strong><\/a>. The coldest pyroCb cloud-top 10.35 \u00b5m infrared brightness temperatures were around -55\u00baC, while the coldest pyroCb Cloud Top Temperature value was -59\u00baC.<\/p>\n This wildfire burned very hot — the peak 3.9 \u00b5m infrared brightness temperature was 138.71\u00baC, which is the saturation temperature of <\/span>ABI<\/span><\/span><\/strong><\/a> Band 7 detecto<\/span>rs.<\/p>\n During the subsequent overnight hours, a toggle between NOAA-20 VIIRS Day\/Night Band (0.7 \u00b5m) and Shortwave Infrared (3.74 \u00b5m) images valid at 1039 UTC or 3:39 AM PDT (below)<\/strong><\/em> showed the bright nighttime glow and hot thermal signature of active fires around the perimeter of the large McKinney Fire<\/span> burn sca<\/span>r. Evacuation orders were in effect for portions of Yreta west of Interstate 5.<\/p>\n