{"id":2577,"date":"2009-05-28T16:47:00","date_gmt":"2009-05-28T16:47:00","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=2577"},"modified":"2009-05-29T20:05:16","modified_gmt":"2009-05-29T20:05:16","slug":"tropical-depression-1","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/2577","title":{"rendered":"Tropical Depression #1"},"content":{"rendered":"
\"GOES-12<\/a>

GOES-12 10.7 \u00c2\u00b5m IR images<\/p><\/div>\n

The first tropical depression of the 2009 season<\/strong><\/a> formed off the US East Coast on 28 May 2009<\/strong><\/a>. An AWIPS animation of GOES-12 10.7 \u00c2\u00b5m “IR window” images (above)<\/strong><\/em> revealed several bursts of convection as the canopy of cold cloud tops slowly increased in areal coverage.<\/p>\n

One of the convective bursts occurred around 15:00 UTC , and a comparison of the 1-km resolution MODIS 11.0 \u00c2\u00b5m IR window and the 4-km resolution GOES-12 10.7 \u00c2\u00b5m IR window images around that time (below)<\/strong><\/em> depicted cloud top brightness temperatures several degrees colder on the MODIS image (-72\u00c2\u00ba C<\/strong>, vs -68\u00c2\u00ba C<\/strong> on the GOES-12 IR image)<\/em>.<\/p>\n

\"MODIS<\/a>

MODIS 11.0 \u00c2\u00b5m and GOES-12 10.7 \u00c2\u00b5m IR images<\/p><\/div>\n

Products from the CIMSS Tropical Cyclones<\/strong><\/a> site (below)<\/strong><\/em> showed that the coldest SSM\/I microwave brightness temperatures (red colors)<\/em> were found in the southeastern quadrant of the cold IR cloud shield. In addition, it could be seen that the tropical depression was situated over the warmer waters of the Gulf Stream (SST values greater than 24\u00c2\u00ba C, green colors),<\/em> which was likely aiding in the intensification process. The deep layer wind shear<\/strong><\/a> was also light, which was another factor that favored further intensification.<\/p>\n

\"GOES-12<\/a>

GOES-12 IR + DMSP Microwave + Sea Surface Temperature<\/p><\/div>\n

The Blended Total Precipitable Water product (below)<\/strong><\/em> showed that TPW values were as high as 50-57 mm (2.0 to 2.2 inches, <\/em> red colors)<\/em> in the vicinity of the tropical depression. The POES AMSU Rainfall Rate<\/strong><\/a> product depicted rainfall intensities as great as 29 mm per hour (1.14 inch per hour)<\/em> around 13:30 UTC.<\/p>\n

\"Blended<\/a>

Blended Total Precipitable Water + GOES-12 IR images<\/p><\/div>\n

===== 29 MAY UPDATE =====<\/strong><\/em><\/p>\n

On the following day (29 May 2009<\/strong>), GOES-12 visible images from the CIMSS Tropical Cyclones<\/strong><\/a> site (below)<\/strong><\/em> indicated that the low-level circulation\u00c2\u00a0 had become separated from the cluster of deep convection which was located in the southeast\u00c2\u00a0 quadrant of the tropical depression — this was due to increasing amounts of deep layer wind shear<\/strong><\/a> across the region.<\/p>\n

\"GOES-12<\/a>

GOES-12 visible images<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

The first tropical depression of the 2009 season formed off the US East Coast on 28 May 2009. An AWIPS animation of GOES-12 10.7 \u00c2\u00b5m “IR window” images (above) revealed several bursts of convection as the canopy of cold cloud tops slowly increased in areal coverage. One of the convective bursts occurred around 15:00 UTC […]<\/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":[15,19,12,26,25,2],"tags":[],"class_list":["post-2577","post","type-post","status-publish","format-standard","hentry","category-goes-sounder","category-goes-12","category-modis","category-poes","category-satellite-winds","category-tropical-cyclones"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/2577","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=2577"}],"version-history":[{"count":15,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/2577\/revisions"}],"predecessor-version":[{"id":2581,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/2577\/revisions\/2581"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=2577"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=2577"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=2577"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}