![\"GOES-16](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2020\/09\/200906_goes16_visible_shortwaveInfrared_fireTemperatureRGB_glmFlashExtentDensity_infraredWindow_CO_pyroCb_anim.gif\")
<\/a>GOES-16 \u201cRed\u201d Visible (0.64 \u00b5m, top left),<\/em> Shortwave Infrared (3.9 \u00b5m, top right),<\/em> Fire Temperature RGB + GLM Flash Extent Density (bottom left)<\/em> and \u201cClean\u201d Infrared Window (10.35 \u00b5m, bottom right)<\/em> [click to play animation | MP4<\/strong><\/a>]<\/p><\/div>1-minute\u00a0Mesoscale Domain Sector<\/strong><\/a> GOES-16 (GOES-East) <\/em>\u201cRed\u201d Visible (0.64 \u00b5m<\/strong><\/a>), GOES-17 Shortwave Infrared (3.9 \u00b5m<\/strong><\/a>),\u00a0Fire Temperature<\/strong><\/a>\u00a0Red-Green-Blue (RGB) +\u00a0GLM<\/strong><\/a>\u00a0Flash Extent Density<\/strong><\/a> (FED) and \u201cClean\u201d Infrared Window (10.35 \u00b5m<\/strong><\/a>) images (above) <\/strong><\/em>showed 2 distinct pulses of pyrocumulonimbus (pyroCb) cloud emanating from the Cameron Peak Fire<\/strong><\/a> in north-central Colorado on 06 September 2020<\/strong><\/a>. The coldest cloud-top infrared brightness temperatures were -52.4\u00baC. Smoke was occasionally restricting the surface visibility to 2 miles at Boulder (KBJC) and 2.5 miles at Fort Collins (KFNL).<\/span><\/p>\n This fire also produced a brief pyroCb cloud on the previous day (below)<\/strong>, <\/em>as shown by a single blue (-40\u00baC) pixel on the 10.35 \u00b5m image at 2301 UTC <\/strong><\/a><\/span>— however, since no Mesoscale Sector was positioned over the area, the fire was only sampled by 5-minute CONUS Sector images. The presence of cloud-top infrared brightness temperatures of -40\u00baC<\/span> and colder assures heterogeneous nucleation of all supercooled water droplets to form ice crystals, thereby meeting the criteria of a pyroCb.<\/p>\n GOES-16 \u201cRed\u201d Visible (0.64 \u00b5m, top left),<\/em> Shortwave Infrared (3.9 \u00b5m, top right),<\/em> Fire Temperature RGB + GLM Flash Extent Density (bottom left)<\/em> and \u201cClean\u201d Infrared Window (10.35 \u00b5m, bottom right)<\/em> [click to play animation | MP4<\/strong><\/a>]<\/p><\/div>\n ===== 07 September Update =====<\/strong><\/p>\n Suomi NPP VIIRS Shortwave Infrared (3.74 \u00b5m)<\/em> and Day\/Night Band (0.7 \u00b5m)<\/em> images, with plots of METAR surface reports [click to enlarge]<\/p><\/div>As the fire continued burning into the nighttime hours, Suomi NPP VIIRS Shortwave Infrared (3.74 \u00b5m) and Day\/Night Band (0.7 \u00b5m) images (above)<\/strong><\/em> displayed the fire around 0916 UTC or 2:16 am PDT on 07 September. Reflected illumination from the Moon — in the Waning Gibbous phase, at 76% of Full — allowed some of the eastward-drifting smoke to be seen.<\/p>\n A toggle between Shortwave Infrared images from Suomi NPP VIIRS (3.74 \u00b5m) and GOES-16 ABI (3.9 \u00b5m) is shown below — the shape of the Cameron Peak Fire thermal anomaly as well as locations of ongoing hot fires along its perimeter were more accurately seen in the 375-m resolution VIIRS<\/strong><\/a> image, compared to the 2-km resolution (at satellite sub-point) ABI<\/strong><\/a> image. The 2 images are time-matched to correspond to the 0922 UTC time of the Suomi NPP satellite’s overpass<\/strong><\/a>.<\/p>\n<\/a><\/a>