{"id":24531,"date":"2017-07-19T23:59:59","date_gmt":"2017-07-19T23:59:59","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=24531"},"modified":"2017-07-21T22:08:59","modified_gmt":"2017-07-21T22:08:59","slug":"midwest-derecho","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/24531","title":{"rendered":"Midwest derecho"},"content":{"rendered":"

\"GOES-16<\/a>

GOES-16 Infrared Window (10.3 \u00b5m) images, with SPC storm reports plotted in cyan [click to play MP4 animation]<\/p><\/div>* GOES-16 data posted on this page are preliminary, non-operational and are undergoing testing *
\n<\/em><\/p>\n

A long-lived mesoscale convective system (MCS) known as a derecho<\/strong><\/a> produced swath of damaging winds — as well as some large hail and a couple of tornadoes — that stretched from north-central South Dakota to northwestern Indiana on 19 July 2017<\/strong><\/a> (SPC storm reports<\/strong><\/a> | TWC summary<\/strong><\/a>). GOES-16 “Clean” Infrared Window (10.3 \u00b5m<\/strong><\/a>) images (above)<\/strong><\/em> showed the southeastward propagation of the storm system.<\/p>\n

Closer views of the early stages of the derecho as it moved across central and eastern South Dakota are shown below, using GOES-16 “Red” Visible (0.64 \u00b5m<\/strong><\/a>) and Infrared Window (10.3 \u00b5m) images. The highest measured wind gust was 100 mph near Polo (1522 UTC<\/strong><\/a>), with 83 mph recorded at Huron (1636<\/strong><\/a> and 1730<\/strong><\/a> UTC). Hail of 2.50 inches in diameter fell near Cavour (1703<\/strong><\/a> UTC). Note that most of the severe reports were in the general vicinity of the persistent cold overshooting top (black to white enhancement)<\/em> seen on the Infrared imagery; due to parallax<\/strong><\/a>, the apparent location of this storm-top feature was shifted slightly north of its true location.<\/p>\n

\"GOES-16<\/a>

GOES-16 Visible (0.64 \u00b5m) images, with SPC storm reports plotted in red [click to play MP4 animation]<\/p><\/div>

\"GOES-16<\/a>

GOES-16 Infrared Window (10.3 \u00b5m) images, with SPC storm reports plotted in cyan [click to play MP4 animation]<\/p><\/div>1-km resolution Terra MODIS Visible (0.65 \u00b5m) and Infrared Window (11.0 \u00b5m) images at (below)<\/strong><\/em> showed the MCS over the Huron (KHON) area at 1656 UTC. Since there is minimal parallax associated with polar-orbiter satellite imagery, the cluster of SPC storm reports (occurring within +\/- 30 minutes of the time of the MODIS image) was much closer to the cold (-70 to -73\u00ba C, lighter gray enhancement)<\/em> overshooting top. Another feature of interest seen on the Infrared image was a “warm trench” (exhibiting brightness temperatures as warm as -60\u00ba C, red enhancement)<\/em> immediately surrounding the cold overshooting top — perhaps a result of compensating subsidence?<\/p>\n

\"Terra<\/a>

Terra MODIS Visible and Infrared Window (11.0 \u00b5m) images, with SPC storm reports [click to enlarge]<\/p><\/div>375-meter resolution Suomi NPP VIIRS Visible (0.64 \u00b5m) and Infrared Window (11.45 \u00b5m) images at 1846 UTC (below)<\/strong><\/em> provided a detailed view of the MCS as it was centered near the South Dakota \/ Minnesota border. The coldest cloud-top IR brightness temperature was -83\u00ba C (violet enhancement)<\/em>.<\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS Visible (0.64 \u00b5m) and Infrared Window (11.45 \u00b5m) images, with SPC storm reports [click to enlarge]<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

* GOES-16 data posted on this page are preliminary, non-operational and are undergoing testing * A long-lived mesoscale convective system (MCS) known as a derecho produced swath of damaging winds — as well as some large hail and a couple of tornadoes — that stretched from north-central South Dakota to northwestern Indiana on 19 July […]<\/p>\n","protected":false},"author":18,"featured_media":24533,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[74,12,3,49,71,48],"tags":[],"class_list":["post-24531","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goes-16","category-modis","category-severe-convection","category-suomi_npp","category-terra","category-viirs"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/24531","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=24531"}],"version-history":[{"count":9,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/24531\/revisions"}],"predecessor-version":[{"id":24541,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/24531\/revisions\/24541"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/24533"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=24531"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=24531"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=24531"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}