{"id":1092,"date":"2008-09-30T17:37:12","date_gmt":"2008-09-30T17:37:12","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=1092"},"modified":"2008-10-01T18:04:39","modified_gmt":"2008-10-01T18:04:39","slug":"cold-front-approaching-hawaii","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/1092","title":{"rendered":"Cold front approaching Hawaii"},"content":{"rendered":"
\"AWIPS<\/a>

AWIPS satellite images + surface analysis<\/p><\/div>\n

A cold frontal boundary was moving southward across the Pacific Ocean and approaching the Hawaiian Islands on 29 September<\/strong><\/a> – 30 September 2008<\/strong><\/a>, as seen on a comparison of AWIPS visible, IR, and water vapor satellite imagery and corresponding surface analysis (above).<\/strong><\/em> According to the boundary layer Meteorological Assimilation Data Ingest System (MADIS) atmospheric motion vectors (below),<\/strong><\/em> the front was moving southward at a speed of around 15-20 knots — IR cloud top temperatures were warmer than 0\u00c2\u00ba C along the frontal cloud band north of Hawaii, suggesting rather shallow cloud features.<\/p>\n

\"AWIPS<\/a>

AWIPS image of GOES-11 10.7 \u00c2\u00b5m IR channel and MADIS winds <\/p><\/div>\n

A closer view using GOES-11 visible imagery (below)<\/strong><\/em> revealed that a series of mesoscale vorticies had developed along the frontal boundary. Another interesting feature was the persistent volcanic plume downwind of the big island of Hawaii (streaming toward the southwest),<\/em> due to ongoing activity at the Kilauea volcano since Spring 2008 (see the April 2008 CIMSS satellite blog entry<\/strong><\/a>). Also note the long, thin line of cumulus clouds below the volcanic plume, a result of lee-side convergence.<\/p>\n

\"GOES-11<\/a>

GOES-11 visible images<\/p><\/div>\n

A comparison of GOES-11 and GOES-13 visible images (below)<\/strong><\/em> shows that the volcanic plume was even more apparent with the larger viewing angle and more favorable “forward scattering” geometry from the GOES-13 satellite (positioned at 105\u00c2\u00ba W longitude, vs. 135\u00c2\u00ba W longitude for GOES-11)<\/em>.<\/p>\n

\"GOES-11<\/a>

GOES-11 and GOES-13 visible images<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

A cold frontal boundary was moving southward across the Pacific Ocean and approaching the Hawaiian Islands on 29 September – 30 September 2008, as seen on a comparison of AWIPS visible, IR, and water vapor satellite imagery and corresponding surface analysis (above). According to the boundary layer Meteorological Assimilation Data Ingest System (MADIS) atmospheric motion […]<\/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":[18,11,25,9],"tags":[],"class_list":["post-1092","post","type-post","status-publish","format-standard","hentry","category-goes-11","category-goes-13","category-satellite-winds","category-volcanic-activity"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/1092","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=1092"}],"version-history":[{"count":6,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/1092\/revisions"}],"predecessor-version":[{"id":1109,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/1092\/revisions\/1109"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=1092"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=1092"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=1092"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}