{"id":42386,"date":"2021-09-09T23:59:00","date_gmt":"2021-09-09T23:59:00","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=42386"},"modified":"2021-09-10T21:55:29","modified_gmt":"2021-09-10T21:55:29","slug":"pyrocumulonimbus-clouds-produced-by-the-cougar-peak-fire-in-oregon","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/42386","title":{"rendered":"Pyrocumulonimbus clouds produced by the Cougar Peak Fire in Oregon"},"content":{"rendered":"<div style=\"width: 655px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2021\/09\/210909_goes17_visible_shortwaveInfrared_infraredWindow_fireTemperatureRGB_Cougar_Peak_Fire_OR_anim.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2021\/09\/or_4p-20210910_004725.png\" width=\"645\" height=\"301\" \/><\/a><p class=\"wp-caption-text\">GOES-17 \u201cRed\u201d Visible (0.64 \u00b5m, top left), Shortwave Infrared (3.9 \u00b5m, top right), \u201cClean\u201d Infrared Window (10.35 \u00b5m, bottom left), and Fire Temperature RGB (bottom right) [click to play animation | <a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2021\/09\/210909_goes17_visible_shortwaveInfrared_infraredWindow_fireTemperatureRGB_Cougar_Peak_Fire_OR_anim.mp4\"><strong>MP4<\/strong><\/a>]<\/p><\/div>\n<div class=\"entry\">1-minute <a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/2322\"><strong>Mesoscale Domain Sector<\/strong><\/a>\u00a0GOES-17 <em>(GOES-West)<\/em>\u00a0\u201cRed\u201d Visible (<a href=\"http:\/\/cimss.ssec.wisc.edu\/goes\/OCLOFactSheetPDFs\/ABIQuickGuide_Band02.pdf\"><strong>0.64 \u00b5m<\/strong><\/a>), Shortwave Infrared (<a href=\"http:\/\/cimss.ssec.wisc.edu\/goes\/OCLOFactSheetPDFs\/ABIQuickGuide_Band07.pdf\"><strong>3.9 \u00b5m<\/strong><\/a>), \u201cClean\u201d Infrared Window (<strong><a href=\"http:\/\/cimss.ssec.wisc.edu\/goes\/OCLOFactSheetPDFs\/ABIQuickGuide_Band13.pdf\">10.35 \u00b5m<\/a><\/strong>) and\u00a0<a href=\"https:\/\/rammb.cira.colostate.edu\/training\/visit\/quick_guides\/Fire_Temperature_RGB.pdf\"><strong>Fire Temperature RGB<\/strong><\/a>\u00a0images\u00a0<em><strong>(above)<\/strong><\/em> revealed that the\u00a0<a href=\"https:\/\/inciweb.nwcg.gov\/incident\/7835\/\"><strong>Cougar Peak Fire<\/strong><\/a> in southern Oregon produced a pair of <a href=\"https:\/\/journals.ametsoc.org\/mwr\/article\/145\/6\/2235\/342946\/A-Conceptual-Model-for-Development-of-Intense\"><strong>pyrocumulonimbus<\/strong><\/a> (pyroCb) clouds\u2014 denoted by cloud-top 10.35 \u00b5m infrared brightness temperatures of -40\u00baC or colder (with the coldest being -64.9\u00baC at <a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2021\/09\/or_4p-20210910_004725.png\"><strong>0047 UTC<\/strong><\/a>) \u2014 late in the day on<strong>\u00a0<a href=\"https:\/\/www.wpc.ncep.noaa.gov\/dailywxmap\/index_20210909.html\">09 September 2021<\/a><\/strong>. The maximum surface 3.9 \u00b5m brightness temperature sensed with this fire was 138.7\u00baC \u2014 which is the saturation temperature for the <a href=\"https:\/\/www.goes-r.gov\/spacesegment\/abi.html\"><strong>ABI<\/strong><\/a> Band 7 detectors. Since it was exhibiting extreme fire behavior during this time, evacuation orders were being increased for the immediate area.<\/div>\n<div>\u00a0<\/div>\n<div>5-minute GOES-17 True Color RGB images created using <a href=\"https:\/\/www.ssec.wisc.edu\/software\/geo2grid\/\"><strong>Geo2Grid<\/strong><\/a>\u00a0<em><strong>(below)<\/strong><\/em> showed a larger-scale view of the 2 pyroCb clouds. Also apparent were smoke-filled clouds &#8212; characterized by shades of tan to light brown &#8212; from fires in northern California, which were drifting north-northeastward across southern Oregon and the Cougar Peak Fire.<\/div>\n<div>\u00a0<\/div>\n<div>\n<div style=\"width: 655px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2021\/09\/210909_goes17_trueColorRGB_Cougar_Peak_Fire_OR_anim.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2021\/09\/GOES-17_ABI_RadC_true_color_2021253_004617Z.png\" width=\"645\" height=\"645\" \/><\/a><p class=\"wp-caption-text\">GOES-17 True Color RGB images [click to play animation | <a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2021\/09\/210909_goes17_trueColorRGB_Cougar_Peak_Fire_OR_anim.mp4\"><strong>MP4<\/strong><\/a>]<\/p><\/div>\n<\/div>\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>1-minute Mesoscale Domain Sector\u00a0GOES-17 (GOES-West)\u00a0\u201cRed\u201d Visible (0.64 \u00b5m), Shortwave Infrared (3.9 \u00b5m), \u201cClean\u201d Infrared Window (10.35 \u00b5m) and\u00a0Fire Temperature RGB\u00a0images\u00a0(above) revealed that the\u00a0Cougar Peak Fire in southern Oregon produced a pair of pyrocumulonimbus (pyroCb) clouds\u2014 denoted by cloud-top 10.35 \u00b5m infrared brightness temperatures of -40\u00baC or colder (with the coldest being -64.9\u00baC at 0047 UTC) [&hellip;]<\/p>\n","protected":false},"author":18,"featured_media":42388,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[6,80,45],"tags":[],"class_list":["post-42386","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fire-detection","category-goes-17","category-redgreenblue-rgb-images"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/42386","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/comments?post=42386"}],"version-history":[{"count":6,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/42386\/revisions"}],"predecessor-version":[{"id":42402,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/42386\/revisions\/42402"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/42388"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=42386"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=42386"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=42386"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}