{"id":612,"date":"2008-02-25T23:44:48","date_gmt":"2008-02-25T23:44:48","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/612"},"modified":"2008-03-08T14:31:02","modified_gmt":"2008-03-08T14:31:02","slug":"return-flow-from-the-gulf-of-mexico","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/612","title":{"rendered":"“Return flow” of moisture from the Gulf of Mexico"},"content":{"rendered":"

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

With a dome of high pressure centered over the southeastern US<\/strong><\/a> early in the day on 25 February 2008<\/strong><\/a>, the Gulf Coast of Texas began to experience a southeasterly onshore flow during the pre-dawn hours. AWIPS images of the GOES-12 10.7\u00c2\u00b5m IR channel (above)<\/strong><\/em> revealed a subtle signature of slightly warmer<\/em> cloud top temperatures (darker gray enhancements)<\/em> associated with the “return flow” of fog and stratus as moisture over the Gulf of Mexico began to move inland across Texas.<\/p>\n

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

The GOES-12 fog\/stratus product (above)<\/strong><\/em> was better able to detect the inland progression of the leading edge of the fog\/stratus features (darker yellow to orange enhancements),<\/em> as well as the development of separate areas of radiation fog further inland (lighter yellow enhancement)<\/em>.<\/p>\n

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

A new satellite product that has recently been added to AWIPS (beginning with Operational Build 8.2)<\/em> is the GOES Low Cloud Base product<\/strong><\/a> (above)<\/strong>,<\/em> which provides an indicator of whether the base (or bottom) of a cloud\/fog feature meets the aviation criteria of Instrument Flight Rules (IFR<\/strong>) <\/em>with bases less than 1000 feet above ground level (red enhancement),<\/em> or Marginal Visual Flight Rules (MVFR<\/strong>) <\/em>with bases greater than 1000 feet but less than 3000 feet above ground level (green enhancement),<\/em> or cirrus cloud (blue enhancement). <\/em>Note that the GOES Low Cloud Base product is only valid during night-time <\/em>hours<\/strong>; this is also true of the GOES fog\/stratus product (due to the fact the the 3.9\u00c2\u00b5m shortwave IR channel used for those satellite products is very sensitive to reflected solar radiation during daylight hours)<\/em>.
\n<\/em><\/p>\n

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

A comparison of the 4-km resolution GOES-12 IR image, fog\/stratus product, and low cloud base product with the 1-km resolution MODIS fog\/stratus product (above)<\/strong><\/em> shows the advantage of better spatial resolution for detecting the leading edge of the inland-moving fog\/stratus features, and also for estimating what portions of the areas of fog\/stratus might be vertically deeper<\/strong> (denoted by the darker orange to red enhancements)<\/em>. The spatial resolution of the IR channels on the Advanced Baseline Imager (ABI)<\/strong><\/a> instrument aboard the GOES-R<\/strong><\/a> satellite (planned to be launched in 2014)<\/em> will be 2 km, which will provide improved detection of mesoscale features compared to the 4 km IR channels and products now available from the current generation of GOES imagers. And what about the Sounder instrument aboard GOES-R and beyond? We refer you to the VISIT Meteorological Interpretation Blog<\/strong><\/a> for a discussion of that particular topic…<\/p>\n","protected":false},"excerpt":{"rendered":"

With a dome of high pressure centered over the southeastern US early in the day on 25 February 2008, the Gulf Coast of Texas began to experience a southeasterly onshore flow during the pre-dawn hours. AWIPS images of the GOES-12 10.7\u00c2\u00b5m IR channel (above) revealed a subtle signature of slightly warmer cloud top temperatures (darker […]<\/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":[21,13,19,34,12],"tags":[],"class_list":["post-612","post","type-post","status-publish","format-standard","hentry","category-aviation","category-fog-detection","category-goes-12","category-goes-r","category-modis"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/612","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=612"}],"version-history":[{"count":0,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/612\/revisions"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=612"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=612"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=612"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}