{"id":28488,"date":"2018-06-11T23:59:08","date_gmt":"2018-06-11T23:59:08","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=28488"},"modified":"2018-12-01T22:18:17","modified_gmt":"2018-12-01T22:18:17","slug":"mesoscale-convective-system-in-the-plains","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/28488","title":{"rendered":"Mesoscale Convective System in the Plains"},"content":{"rendered":"

\"GOES-16<\/a>

GOES-16 “Clean” Infrared Window (10.3 \u00b5m)<\/em> images, with plots of SPC storm reports [click to play MP4 animation]<\/p><\/div>A Mesoscale Convective System (MCS) developed over eastern Nebraska early in the evening on 11 June 2018<\/strong><\/a>, then propagated southward across the Plains during the subsequent overnight hours. GOES-16 (GOES-East)<\/em> “Clean” Infrared Window (10.3 \u00b5m<\/strong><\/a>) images with plots of SPC storm reports<\/strong><\/a> are shown above; a Mesoscale Sector was positioned over the region, providing images at 1-minute intervals.<\/p>\n

A closer look over Kansas using Infrared imagery from polar-orbiting satellites (below)<\/strong><\/em> revealed some very cold cloud-top infrared brightness temperatures, which included -87\u00baC on MODIS, -90\u00baC on VIIRS and -92\u00baC on AVHRR<\/strong><\/a>.<\/p>\n

\"POES<\/a>

Metop-B AVHRR, Terra\/Aqua MODIS and Suomi NPP VIIRS Infrared images, with plots of SPC storm reports [click to enlarge]<\/p><\/div>The coldest air temperature on 00 UTC rawinsonde data<\/strong><\/a> from Dodge City and Topeka, Kansas (below)<\/strong><\/em> was -69.5\u00baC (at altitudes of 14.6 km\/49,900 feet at Dodge City, and 17.6 km\/57,700 feet at Topeka) — so in theory air parcels and cloud material within a vigorous overshooting top could have ascended a few km (or thousands of feet) beyond those altitudes to exhibit an infrared brightness temperature of -92\u00baC.<\/p>\n

\"Plots<\/a>

Plots of rawinsonde data from Dodge City and Topeka, Kansas [click to enlarge]<\/p><\/div>A toggle between re-mapped versions of the GOES-16 ABI and Metop-B AVHRR Infrared imagery over Kansas at the time of the very cold cloud-top infrared brightness temperature (below)<\/strong><\/em> revealed 2 important points: (1) with improved spatial resolution (1 km<\/strong> for AVHRR, vs 2 km<\/strong> *at satellite sub-point* for ABI)<\/em> the instrument detectors sensed much colder temperatures (-92.6\u00baC<\/strong> with AVHRR vs -81.2\u00baC<\/strong> with ABI), and (2) due to parallax<\/strong><\/a>. the GOES-16 image features are displaced to the northwest. In addition to the isolated cold overshooting top in south-central Kansas, note the pronounced enhanced-V<\/strong><\/a> storm top signature in far northeastern Kansas.<\/p>\n

\"Comparison<\/a>

Comparison of GOES-16 ABI and Metop-B AVHRR Infrared images [click to enlarge]<\/p><\/div>.<\/p>\n","protected":false},"excerpt":{"rendered":"

A Mesoscale Convective System (MCS) developed over eastern Nebraska early in the evening on 11 June 2018, then propagated southward across the Plains during the subsequent overnight hours. GOES-16 (GOES-East) “Clean” Infrared Window (10.3 \u00b5m) images with plots of SPC storm reports are shown above; a Mesoscale Sector was positioned over the region, providing images […]<\/p>\n","protected":false},"author":18,"featured_media":28490,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[70,22,74,58,12,3,49,71,48],"tags":[],"class_list":["post-28488","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aqua","category-avhrr","category-goes-16","category-metop","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\/28488","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=28488"}],"version-history":[{"count":9,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/28488\/revisions"}],"predecessor-version":[{"id":30921,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/28488\/revisions\/30921"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/28490"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=28488"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=28488"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=28488"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}