{"id":2016,"date":"2009-02-23T21:58:38","date_gmt":"2009-02-23T21:58:38","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=2016"},"modified":"2009-02-24T22:57:23","modified_gmt":"2009-02-24T22:57:23","slug":"occluding-cyclone-off-the-pacfic-northwest-coast","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/2016","title":{"rendered":"Occluding cyclone off the Pacfic Northwest coast"},"content":{"rendered":"
\"GOES-11<\/a>

GOES-11 and GOES-13 water vapor images<\/p><\/div>\n

A cyclone off the Pacific Northwest coast was maturing and entering the occluded stage on 23 February 2009<\/strong><\/a>. An animation of\u00c2\u00a0 GOES-11 and\u00c2\u00a0 GOES-13 water vapor channel imagery (above)<\/strong><\/em> showed a very compact “dry swirl” signature that often signals a cyclone’s transition to the occluded stage. Note that the subtle features and gradients are more clear on the 4-km resolution GOES-13 water vapor channel data (compared to the 8-km resolution of the GOES-11 water vapor channel data)<\/em>.<\/p>\n

An AWIPS image of the GOES-11 water vapor image with surface reports and HPC-analyzed surface fronts\u00c2\u00a0 (below)<\/strong><\/em> displayed the relationship between the satellite features and the surface features. Note that ship 3FMH7<\/strong> (located to the north of the occluded front)<\/em> reported blowing spray (group 70722)<\/strong> at 18 UTC — the present weather symbol on the station model plot that is used for “blowing dust\/sand” is also used for blowing spray at sea.<\/p>\n

\"GOES-11<\/a>

GOES-11 water vapor image (with surface fronts and surface data)<\/p><\/div>\n

A comparison of the GOES-11 water vapor image and the GOES-11 sounder Total Column Ozone product at 16:00 UTC (below)<\/strong><\/em> indicated that ozone values were quite high (in excess of 450 Dobson Units, lighter red color enhancement)<\/em> over the region of the occluding cyclone.<\/p>\n

\"GOES-11<\/a>

GOES-11 water vapor + GOES-11 sounder Total Column Ozone<\/p><\/div>\n

A west-to-east cross section along Line G-G’ using 18:00 UTC NAM80 model fields (below)<\/strong><\/em> showed that the dynamic tropopause (taken to be the height of the PV1.5 potential vorticity surface)<\/em> had descended to below the 500 hPa pressure level in the vicinity of the occluding cyclone.<\/p>\n

\"NAM80<\/a>

Cross section of NAM80 model fields <\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

A cyclone off the Pacific Northwest coast was maturing and entering the occluded stage on 23 February 2009. An animation of\u00c2\u00a0 GOES-11 and\u00c2\u00a0 GOES-13 water vapor channel imagery (above) showed a very compact “dry swirl” signature that often signals a cyclone’s transition to the occluded stage. Note that the subtle features and gradients are more […]<\/p>\n","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[15,18,11,8],"tags":[],"class_list":["post-2016","post","type-post","status-publish","format-standard","hentry","category-goes-sounder","category-goes-11","category-goes-13","category-marine-weather"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/2016","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=2016"}],"version-history":[{"count":11,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/2016\/revisions"}],"predecessor-version":[{"id":2022,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/2016\/revisions\/2022"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=2016"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=2016"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=2016"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}