{"id":525,"date":"2007-09-18T23:28:26","date_gmt":"2007-09-18T23:28:26","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/2007\/09\/19\/intensifying-upper-level-low-over-florida\/"},"modified":"2007-09-21T04:28:12","modified_gmt":"2007-09-21T04:28:12","slug":"intensifying-upper-level-low-over-florida","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/525","title":{"rendered":"Intensifying upper-level low over Florida"},"content":{"rendered":"<p><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2007\/09\/070918_g12_wv_anim.gif\" title=\"GOES-12 water vapor images (Animated GIF)\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2007\/09\/070918_g12_wv_anim.gif\" title=\"GOES-12 water vapor images (Animated GIF)\" alt=\"GOES-12 water vapor images (Animated GIF)\" align=\"middle\" height=\"360\" width=\"480\" \/><\/a><\/p>\n<p>AWIPS images of the GOES-12 6.5\u00c2\u00b5m &#8220;water vapor&#8221; channel <em><strong>(above)<\/strong><\/em> show an upper-level low that was intensifying over Florida during the day on <a href=\"http:\/\/www.hpc.ncep.noaa.gov\/dailywxmap\/index_20070918.html\" title=\"18 September 2007 daily weather map\" target=\"_blank\"><strong>18 September 2007<\/strong><\/a>. As warm\/dry middle to upper tropospheric air <em>(yellow enhancement)<\/em> wrapped around and into the southwestern quadrant of the cyclone, convection was seen to develop along the southern Gulf Coast of Florida. This dry air was associated with a <strong>tropopause anomaly<\/strong>, where the &#8220;dynamic tropopause&#8221; <em>(taken to be the 1.5 Potential Vorticity Unit contour)<\/em> descended to around the 380 hPa pressure level according to the GFS40 model <em><strong>(below)<\/strong><\/em>.<\/p>\n<p><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2007\/09\/GFS40_PV15_Pressure_20070918_1800F000.png\" title=\"GOES-12 water vapor image + GFS PV1.5 pressure\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2007\/09\/GFS40_PV15_Pressure_20070918_1800F000.png\" title=\"GOES-12 water vapor image + GFS PV1.5 pressure\" alt=\"GOES-12 water vapor image + GFS PV1.5 pressure\" align=\"middle\" height=\"361\" width=\"480\" \/><\/a><\/p>\n<p>A cross section of GFS40 model fields (oriented from east on the left to west on the right) across Florida <em><strong>(below)<\/strong><\/em>  reveals the lowering tropopause <em><strong> <\/strong>(color shaded potential vorticity values)<\/em> and descending dry air <em>(dashed green specific humidity contours)<\/em> associated with the tropopause anomaly. Surface pressures were beginning to fall across that region in response to the tropopause anomaly, raising speculation that a subtropical or a tropical cyclone could eventually develop from this system as it moves slowly westward into the Gulf of Mexico.<\/p>\n<p><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2007\/09\/GFS40_lineA__Pot_Vorticity_20070918_1800F000.png\" title=\"GFS cross section\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2007\/09\/GFS40_lineA__Pot_Vorticity_20070918_1800F000.png\" title=\"GFS cross section\" alt=\"GFS cross section\" align=\"middle\" height=\"458\" width=\"480\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>AWIPS images of the GOES-12 6.5\u00c2\u00b5m &#8220;water vapor&#8221; channel (above) show an upper-level low that was intensifying over Florida during the day on 18 September 2007. As warm\/dry middle to upper tropospheric air (yellow enhancement) wrapped around and into the southwestern quadrant of the cyclone, convection was seen to develop along the southern Gulf Coast [&hellip;]<\/p>\n","protected":false},"author":18,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[10,19],"tags":[],"class_list":["post-525","post","type-post","status-publish","format-standard","hentry","category-general-interpretation","category-goes-12"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/525","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=525"}],"version-history":[{"count":0,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/525\/revisions"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=525"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=525"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=525"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}