{"id":64256,"date":"2025-04-17T23:59:00","date_gmt":"2025-04-17T23:59:00","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=64256"},"modified":"2025-04-26T18:38:07","modified_gmt":"2025-04-26T18:38:07","slug":"severe-thunderstorms-in-nebraska-and-iowa","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/64256","title":{"rendered":"Severe thunderstorms in Nebraska and Iowa"},"content":{"rendered":"

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1-minute GOES-19 \u201cRed\u201d Visible (0.64 \u00b5m) images with time-matched (+\/- 3 minutes) SPC Storm Reports plotted in red, from 2200 UTC on 17 April to 0056 UTC on 18 April [click to play animated GIF | MP4<\/strong><\/a>]<\/p><\/div>1-minute Mesoscale Domain Sector GOES-19 (GOES-East)<\/em> \u201cRed\u201d Visible (0.64 \u00b5m) images (above)<\/strong><\/em> showed 2 supercell thunderstorms that produced numerous tornadoes, hail to 4.00″ in diameter and wind gusts to 86 mph (SPC Storm Reports<\/strong><\/a> | NWS Omaha event summary<\/strong><\/a>) across parts of eastern Nebraska and western Iowa on 17 April 2025<\/strong><\/a>. Pulses of overshooting tops in addition to Above-Anvil Cirrus Plumes<\/strong><\/a> were apparent with these thunderstorms.<\/p>\n

In the corresponding 1-minute GOES-19 \u201cClean\u201d Infrared Window (10.3 \u00b5m) images (below)<\/strong><\/em>, the coldest cloud-top infrared brightness temperatures associated with some of the pulsing overshooting tops were in the -75 to -78\u00baC range.<\/p>\n

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1-minute GOES-19 \u201cClean\u201d Infrared Window (10.3 \u00b5m) images with time-matched (+\/- 3 minutes) SPC Storm Reports plotted in white, from 2200 UTC on 17 April to 0211 UTC on 18 April [click to play animated GIF | MP4<\/strong><\/a>]<\/p><\/div>In a toggle between GOES-19 Visible and Infrared images at 2322 UTC (below)<\/strong><\/em>, there was a pronounced “warm trench” immediately downwind (east) of the cold overshooting top associated with the northernmost supercell thunderstorm. Hail of 2.75″ in diameter and a wind gust of 82 mph were reported near the overshooting top\/warm trench around the time of these two GOES-19 images (note: the SPC Storm Reports are plotted at their surface location, and are not corrected for storm-top parallax<\/strong><\/a>).<\/p>\n

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GOES-19 Visible and Infrared images at 2322 UTC on 17 April [click to enlarge]<\/p><\/div>The 2322 UTC GOES-19 Infrared image with labels of cloud-top infrared brightness temperatures of the cold overshooting top (-74.1 \u00baC) and adjacent downwind warm trench (-51.1 \u00baC) is shown below.<\/p>\n

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GOES-19 Infrared image at 2322 UTC on 17 April, with labels of cloud-top infrared brightness temperatures of the overshooting top and adjacent downwind warm trench [click to enlarge]<\/p><\/div>According to a plot of 2000 UTC rawinsonde data from Omaha, Nebraska (below)<\/strong><\/em>, the coldest cloud-top infrared brightness temperatures of -78\u00baC represented a ~2 km overshoot of the Most Unstable air parcel Equilibrium Level (MU EL).<\/p>\n

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Plot of Omaha, Nebraska rawinsonde data at 2000 UTC on 17 April [click to enlarge]<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

1-minute Mesoscale Domain Sector GOES-19 (GOES-East) \u201cRed\u201d Visible (0.64 \u00b5m) images (above) showed 2 supercell thunderstorms that produced numerous tornadoes, hail to 4.00″ in diameter and wind gusts to 86 mph (SPC Storm Reports | NWS Omaha event summary) across parts of eastern Nebraska and western Iowa on 17 April 2025. Pulses of overshooting tops […]<\/p>\n","protected":false},"author":18,"featured_media":64370,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[159,3],"tags":[],"class_list":["post-64256","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\/64256","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=64256"}],"version-history":[{"count":14,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/64256\/revisions"}],"predecessor-version":[{"id":64439,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/64256\/revisions\/64439"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/64370"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=64256"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=64256"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=64256"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}