{"id":644,"date":"2008-04-24T23:58:58","date_gmt":"2008-04-24T23:58:58","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/644"},"modified":"2008-04-25T23:10:13","modified_gmt":"2008-04-25T23:10:13","slug":"outflow-boundaries-storm-top-signatures-and-swaths-of-rain-cooled-ground","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/644","title":{"rendered":"Outflow boundaries, storm top signatures, and swaths of rain-cooled ground"},"content":{"rendered":"

\"GOES-12<\/a><\/p>\n

Clusters of severe thunderstorms developed along the Texas \/ New Mexico border region during the late morning and afternoon hours on 23 April 2008<\/strong><\/a>. GOES-12 visible images (above)<\/strong><\/em> showed multiple low-level convective outflow boundaries that moved westward — and these outflow boundaries then played a role in subsequent convective development later in the day. The GOES-12 satellite had been placed into Rapid Scan Operations (RSO) mode, allowing images to be available as frequently as every 5-10 minutes during the daylight hours.<\/p>\n

A comparison of 1-km resolution MODIS and 4-km resolution GOES-12 IR images (below)<\/strong><\/em> demonstrated the superior storm top temperature detection capability of the MODIS data — the largest storm over northwest Texas (located in the center of the image, between Abilene KABI and Lubbock KLBB)<\/em> exhibited a well-defined “enhanced-v” signature on the MODIS imagery, in addition to a “warm trench” signature surrounding an area of overshooting tops just to the west of the enhanced-v. Note that the features on the GOES-12 IR image appear to be displaced a bit to the north\/northwest compared to the MODIS IR image — this is a result of “parallax error” due to the large viewing angle of the GOES-12 satellite (which is positioned over the Equator at 75\u00c2\u00ba W longitude)<\/em>.<\/p>\n

\"GOES-12<\/a><\/p>\n

These thunderstorms produced heavy rainfall, and were also responsible for a number of reports of tornadoes, large hail, and damaging winds (SPC storm reports<\/strong><\/a>). Isolated locations reported rainfall of 2 inches or more, creating several large swaths of wet ground which were very evident on MODIS IR and Land Surface temperature (LST) images (below)<\/strong><\/em> from the next day (24 April 2008<\/strong><\/a>). While the swaths of wet ground remained relatively cool during the following day (yellow to orange to light red colors),<\/em> the surrounding dry ground areas were able to heat up much more quickly, exhibiting significantly warmer IR brightness temperature and LST values (darker red to black colors)<\/em>. In addition, a burn scar from a large fire that burned back in February 2008<\/strong><\/a> could still be seen, with slightly warmer IR temperatures and LST showing up in the area of the burn scar (located just northwest of San Angelo, KSJT)<\/em>.<\/p>\n

\"MODIS<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Clusters of severe thunderstorms developed along the Texas \/ New Mexico border region during the late morning and afternoon hours on 23 April 2008. GOES-12 visible images (above) showed multiple low-level convective outflow boundaries that moved westward — and these outflow boundaries then played a role in subsequent convective development later in the day. The […]<\/p>\n","protected":false},"author":18,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[19,16,12,3],"tags":[],"class_list":["post-644","post","type-post","status-publish","format-standard","hentry","category-goes-12","category-heavy-rain-flooding","category-modis","category-severe-convection"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/644","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=644"}],"version-history":[{"count":0,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/644\/revisions"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=644"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=644"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=644"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}