{"id":71768,"date":"2026-08-11T17:59:00","date_gmt":"2026-08-11T17:59:00","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=71768"},"modified":"2026-08-13T22:08:39","modified_gmt":"2026-08-13T22:08:39","slug":"severe-weather-across-northeastern-illinois-and-northwestern-indiana","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/71768","title":{"rendered":"Severe weather across northeastern Illinois and northwestern Indiana"},"content":{"rendered":"\n<figure class=\"wp-block-video aligncenter\"><video autoplay controls loop muted src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2026\/08\/G19_VIS_IL_IN_SVR_11AUG2026_loop_GOES-19_2026223_140055_2026223_172255.mp4\" playsinline><\/video><figcaption class=\"wp-element-caption\"><em>1-minute GOES-19 Visible images with time-matched plots of SPC Storm Reports, from 1400-1722 UTC on 11 August<\/em><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">1-minute Mesoscale Domain Sector GOES-19 <em>(GOES-East)<\/em> Visible images <strong><em>(above)<\/em><\/strong> and Infrared Window images <strong><em>(below)<\/em><\/strong> included time-matched plots of <strong><a href=\"https:\/\/www.spc.noaa.gov\/climo\/reports\/260811_rpts.html\">SPC Storm Reports<\/a><\/strong> &#8212; which showed thunderstorms that produced several tornadoes and wind gusts as high as 97 mph in Illinois, and hail as large as 3.00&#8243; in diameter in Indiana. The high concentration of damaging winds in the northeast Illinois and northwest Indiana area was only a portion of a derecho event that spanned from eastern Iowa to eastern Kentucky (<strong><a href=\"https:\/\/www.weather.gov\/lot\/2026_08_11_Derecho\">NWS Chicago<\/a><\/strong> | <strong><a href=\"https:\/\/www.weather.gov\/iwx\/SevereWx_Derecho_Aug11th2026\">NWS Northern Indiana<\/a><\/strong>).<\/p>\n\n\n\n<figure class=\"wp-block-video aligncenter\"><video autoplay controls loop muted src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2026\/08\/G19_IR_IL_IN_SVR_11AUG2026_loop_GOES-19_2026223_140055_2026223_172255.mp4\" playsinline><\/video><figcaption class=\"wp-element-caption\"><em>1-minute GOES-19 Infrared Window images with time-matched plots of SPC Storm Reports, from 1400-1722 UTC on 11 August <\/em><\/figcaption><\/figure>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2026\/08\/G19_IR_IL_IN_SVR_11AUG2026_B13_2026223_154155_GOES-19_0001PANEL_FRAME00102.GIF\"><img decoding=\"async\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2026\/08\/G19_IR_IL_IN_SVR_11AUG2026_B13_2026223_154155_GOES-19_0001PANEL_FRAME00102.GIF\" alt=\"\"\/><\/a><figcaption class=\"wp-element-caption\"><em>GOES-19 Infrared Window image at 1541 UTC on 11 August, with time-matched plots of SPC Storm Reports [click to enlarge]<\/em><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Thunderstorm overshooting tops exhibited infrared brightness temperatures as cold as -80 to -83 C, denoted by violet pixels <strong><em>(above)<\/em><\/strong>. According to a plot of rawinsonde data from Quad Cities, Illinois <strong>(<em>below)<\/em><\/strong>, those infrared brightness temperatures represented a ~2 km overshoot of the Most Unstable (MU) air parcel&#8217;s Equilibrium Level (EL). For an early morning sounding, it showed a very moist and unstable air mass &#8212; and the Downdraft CAPE (<strong><a href=\"https:\/\/www.weather.gov\/media\/lmk\/soo\/DCAPE_Web.pdfhttps:\/\/www.weather.gov\/media\/lmk\/soo\/DCAPE_Web.pdf\">DCAPE<\/a><\/strong>) value of 1194 J\/kg highlighted the potential for strong downward transport of momentum to the surface, helping to produce the widespread wind damage that was observed.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2026\/08\/260811_1200utc_kdvn_raob.png\"><img decoding=\"async\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2026\/08\/260811_1200utc_kdvn_raob.png\" alt=\"\"\/><\/a><figcaption class=\"wp-element-caption\"><em>Plot of rawinsonde data from Quad Cities, Illinois at 1200 UTC on 11 August [click to enlarge]<\/em><\/figcaption><\/figure>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>1-minute Mesoscale Domain Sector GOES-19 (GOES-East) Visible images (above) and Infrared Window images (below) included time-matched plots of SPC Storm Reports &#8212; which showed thunderstorms that produced several tornadoes and wind gusts as high as 97 mph in Illinois, and hail as large as 3.00&#8243; in diameter in Indiana. The high concentration of damaging winds [&hellip;]<\/p>\n","protected":false},"author":18,"featured_media":71772,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[159,3],"tags":[],"class_list":["post-71768","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goes-19","category-severe-convection"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/71768","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=71768"}],"version-history":[{"count":10,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/71768\/revisions"}],"predecessor-version":[{"id":71802,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/71768\/revisions\/71802"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/71772"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=71768"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=71768"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=71768"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}