{"id":41536,"date":"2021-07-14T23:59:42","date_gmt":"2021-07-14T23:59:42","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=41536"},"modified":"2021-07-17T00:01:47","modified_gmt":"2021-07-17T00:01:47","slug":"pyrocumulonimbus-cloud-produced-by-the-bootleg-fire-in-oregon","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/41536","title":{"rendered":"Pyrocumulonimbus cloud produced by the Bootleg Fire in Oregon"},"content":{"rendered":"

\"GOES-17<\/a>

GOES-17 “Red” Visible (0.64 \u00b5m, top left), Shortwave Infrared (3.9 \u00b5m, top right), “Clean” Infrared Window (10.35 \u00b5m, bottom left) and Fire Temperature RGB (bottom right) [click to play animation | MP4<\/strong><\/a>]<\/p><\/div>1-minute\u00a0Mesoscale Domain Sector<\/strong><\/a>\u00a0GOES-17\u00a0(GOES-West)<\/em> “Red” Visible (0.64 \u00b5m<\/strong><\/a>), Shortwave Infrared (3.9 \u00b5m<\/strong><\/a>), “Clean” Infrared Window (10.35 \u00b5m) and Fire Temperature RGB<\/strong><\/a> images (above)<\/strong><\/em> revealed that the Bootleg Fire<\/strong><\/a> in far southern Oregon produced a pyrocumulonimbus<\/strong><\/a> (pyroCb) cloud — denoted by cloud-top 10.35 \u00b5m infrared brightness temperatures of -40\u00baC and colder (darker blue pixels) — late in the day on 14 July 2021<\/strong><\/a>. The 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

A plot of 00 UTC rawinsonde data from nearby Medford, Oregon (below)<\/em><\/strong> indicated that the -40\u00baC temperature closely corresponded to the height of the tropopause and the Most Unstable (MU) air parcel Equilibrium Level (EL).<\/p>\n

\"Plot<\/a>

Plot of 00 UTC rawinsonde data from Medford, Oregon [click to enlarge]<\/p><\/div>On the following morning, signatures of the upper-tropospheric\/lower-stratospheric smoke that was forced aloft by the pyroCb cloud could be seen arcing east-southeastward over parts of Idaho, Montana and Wyoming on GOES-17 Visible and Near-Infrared “Cirrus” (1.37 \u00b5m<\/strong><\/a>) images (below)<\/em><\/strong>. The smoke signature in 1.37 \u00b5m images was not due to the plume being composed of ice particles; rather, the Cirrus imagery is also able to highlight the presence of particles that are highly effective at scattering sunlight (which includes ice crystals, dust, volcanic ash, smoke) — and the smoke signature was also further highlighted by a favorable forward scattering angle.<\/p>\n

\"GOES-17<\/a>

GOES-17 “Red” Visible (0.64 \u00b5m, top) and Near-Infrared “Cirrus” (1.37 \u00b5m, bottom) images [click to play animation | MP4<\/strong><\/a>]<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

1-minute\u00a0Mesoscale Domain Sector\u00a0GOES-17\u00a0(GOES-West) “Red” Visible (0.64 \u00b5m), Shortwave Infrared (3.9 \u00b5m), “Clean” Infrared Window (10.35 \u00b5m) and Fire Temperature RGB images (above) revealed that the Bootleg Fire in far southern Oregon produced a pyrocumulonimbus (pyroCb) cloud — denoted by cloud-top 10.35 \u00b5m infrared brightness temperatures of -40\u00baC and colder (darker blue pixels) — late in […]<\/p>\n","protected":false},"author":18,"featured_media":41538,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[6,80],"tags":[],"class_list":["post-41536","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fire-detection","category-goes-17"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/41536","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=41536"}],"version-history":[{"count":12,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/41536\/revisions"}],"predecessor-version":[{"id":41572,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/41536\/revisions\/41572"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/41538"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=41536"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=41536"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=41536"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}