{"id":1733,"date":"2009-01-07T23:45:04","date_gmt":"2009-01-07T23:45:04","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=1733"},"modified":"2009-01-09T21:44:49","modified_gmt":"2009-01-09T21:44:49","slug":"occluding-cyclone-over-the-labrador-sea","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/1733","title":{"rendered":"Occluding cyclone over the Labrador Sea"},"content":{"rendered":"
\"GOES-12<\/a>

GOES-12 6.5 \u00c2\u00b5m water vapor images + QuikSCAT winds<\/p><\/div>\n

AWIPS images of the GOES-12 6.5 \u00c2\u00b5m water vapor channel data\u00c2\u00a0 with an overlay of polar-orbiting QuikSCAT winds (above)<\/strong><\/em> showed the a rapidly-occluding cyclone over the Labrador Sea on 07 January 2009<\/a><\/strong>. The classic “dry swirl” signature on the water vapor imagery is a tell-tale indicator that a mature cyclone has reached the occluded phase. Note that the GOES-12 satellite had just returned to service as the operational GOES-East satellite<\/strong><\/a> on the previous day.<\/p>\n

QuikSCAT wind speeds were as high as 58 knots<\/strong> (red wind barbs)<\/em> off the southern tip of Greenland at 09:00 UTC. A comparison of the atmospheric motion vector coverage derived from GOES-12 IR and water vapor channel data with those derived from the WindSat instrument on the polar-orbiting QuikSCAT satellite (below)<\/strong><\/em> demonstrate the advantage of the 12.5 km resolution data from the QuikSCAT satellite — however, the QuikSCAT winds are valid near the surface, while the GOES-12 winds are valid at higher levels within the lower, middle, and even upper the troposphere.<\/p>\n

\"GOES-12<\/a>

GOES-12 water vapor image + GOES-12 winds + QuikSCAT winds<\/p><\/div>\n

The Blended Total Precipitable Water product (below)<\/strong><\/em> depicted a plume of higher PW values (in the 15-25 mm range)<\/em> wrapping around the eastern and northern periphery of the occluding cyclone. The polar-orbiting AMSU instrument indicated that rainfall rates were as high as 7-9 mm\/hour<\/strong><\/a> within this plume of PW.<\/p>\n

\"Blended<\/a>

Blended Total Precipitable Water product<\/p><\/div>\n

\"GOES-12<\/a>

GOES-12 water vapor image + 24-hour forecast of surface pressure<\/p><\/div>\n

The 24-hour forecast had the position of the surface low a bit far to the southwest (above)<\/strong><\/em> — however,\u00c2\u00a0 using the “dry swirl” signature on the water vapor imagery, the well-trained analysts at HPC were able to accurately depict the location of the surface low center as it moved northwestward across the Labrador Sea (below)<\/strong><\/em>.<\/p>\n

\"GOES-12<\/a>

GOES-12 water vapor images + HPC surface frontal and MSLP analysis<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

AWIPS images of the GOES-12 6.5 \u00c2\u00b5m water vapor channel data\u00c2\u00a0 with an overlay of polar-orbiting QuikSCAT winds (above) showed the a rapidly-occluding cyclone over the Labrador Sea on 07 January 2009. The classic “dry swirl” signature on the water vapor imagery is a tell-tale indicator that a mature cyclone has reached the occluded phase. […]<\/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":[19,26,25],"tags":[],"class_list":["post-1733","post","type-post","status-publish","format-standard","hentry","category-goes-12","category-poes","category-satellite-winds"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/1733","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=1733"}],"version-history":[{"count":13,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/1733\/revisions"}],"predecessor-version":[{"id":1735,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/1733\/revisions\/1735"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=1733"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=1733"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=1733"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}