{"id":1180,"date":"2008-10-17T21:17:32","date_gmt":"2008-10-17T21:17:32","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=1180"},"modified":"2008-10-20T14:06:02","modified_gmt":"2008-10-20T14:06:02","slug":"using-satellite-imagery-to-diagnose-areas-of-aircraft-icing-potential","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/1180","title":{"rendered":"Using satellite imagery to help diagnose areas of aircraft icing potential"},"content":{"rendered":"
\"GOES-12<\/a>

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

AWIPS images of the GOES-12 10.7 \u00c2\u00b5m “IR window” channel (above)<\/strong><\/em> showed extensive cloudiness associated with a shortwave trough that was moving eastward across the Upper Midwest region during the morning hours on 17 October 2008<\/strong><\/a>. IR cloud top brightness temperatures of -20\u00c2\u00ba to -40\u00c2\u00ba C (blue to green colors)<\/em> corresponded to areas of light precipitation (radar mosaic<\/strong><\/a>). Also shown on the IR imagery were\u00c2\u00a0 aircraft Icing AIRMET<\/strong><\/a> advisories (outlined in red)<\/em> that were issued at 09:00 UTC and 14:00 UTC –\u00c2\u00a0 the 14:00 UTC AIRMET<\/strong><\/a> was forecasting moderate icing between the freezing level (which was between 5,000 and 10,000 feet)<\/em> and 20,000 feet. In fact, there were a number of aircraft pilot reports of icing (plotted in yellow)<\/em> within the boundaries of these Icing AIRMETs.<\/p>\n

A closer view using AWIPS images of the MODIS visible channel, 11.0 \u00c2\u00b5m “IR window” channel, Cloud Top Temperature (CTT) product, and Cloud Phase product at 17:29 UTC (below)<\/strong><\/em> indicated that much of the cloud shield along the trailing (western)<\/em> edge of the shortwave over Minnesota and Iowa exhibited cloud top temperatures that were below freezing (generally in the -5 to -12\u00c2\u00ba C range),<\/em> but the MODIS Cloud Phase product designated those trailing edge clouds as “Water droplet” clouds (blue enhancement)<\/em>. Within this area of supercooled water droplet<\/strong> clouds were several pilot reports of icing at the 8000-foot altitude\u00c2\u00a0 across southern Minnesota and western\/central Iowa.<\/p>\n

\"MODIS<\/a>

MODIS visible + IR window + Cloud Top Temperature + Cloud Phase<\/p><\/div>\n

A comparison of AWIPS images of the MODIS Cloud Phase product and the GOES-12 sounder Cloud Top Height product (below)<\/strong><\/em> showed that these pilot reports of icing at the 8000 foot level were well below the tops of the clouds, which were generally in the 13,000-15,000 foot range (green colors on the Cloud Top Height product)<\/em>.<\/p>\n

\"MODIS<\/a>

MODIS Cloud Phase product + GOES-12 sounder Cloud Top Height product<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

AWIPS images of the GOES-12 10.7 \u00c2\u00b5m “IR window” channel (above) showed extensive cloudiness associated with a shortwave trough that was moving eastward across the Upper Midwest region during the morning hours on 17 October 2008. IR cloud top brightness temperatures of -20\u00c2\u00ba to -40\u00c2\u00ba C (blue to green colors) corresponded to areas of light […]<\/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":[21,15,19,12],"tags":[],"class_list":["post-1180","post","type-post","status-publish","format-standard","hentry","category-aviation","category-goes-sounder","category-goes-12","category-modis"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/1180","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=1180"}],"version-history":[{"count":16,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/1180\/revisions"}],"predecessor-version":[{"id":1184,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/1180\/revisions\/1184"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=1180"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=1180"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=1180"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}