{"id":9985,"date":"2012-03-15T21:53:09","date_gmt":"2012-03-15T21:53:09","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=9985"},"modified":"2012-03-16T22:35:17","modified_gmt":"2012-03-16T22:35:17","slug":"undular-bore-along-the-leading-edge-of-a-pneumonia-front-over-lake-michigan","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/9985","title":{"rendered":"Undular bore along the leading edge of a “pneumonia front” over Lake Michigan"},"content":{"rendered":"
\"MODIS<\/a>

MODIS true-color Red\/Green\/Blue (RGB) images<\/p><\/div>\n

250-meter resolution Terra and Aqua MODIS true-color Red\/Green\/Blue (RGB) images from the SSEC MODIS Today<\/strong><\/a> site (above)<\/strong><\/em> revealed the presence of an undular bore along the leading edge of a southward-moving cold front (also known regionally as a “pneumonia front<\/strong><\/a>“)<\/em> on 15 March 2012<\/strong><\/a>.<\/p>\n

AWIPS images of the MODIS Sea Surface Temperature (SST) product (below)<\/strong><\/em> indicated that SST values in the central portion of Lake Michigan (behind the cold frontal boundary) were generally in the upper 30s to low 40s F (darker blue color enhancement)<\/em>. At Racine in southeastern Wisconsin (station identifier KRAC),<\/em> the surface air temperature dropped from 69 F to 47 F in 2 hours after the front passed. Just to the north, the high temperature of 72 F at Milwaukee (station identifier KMKE)<\/em> set a record high for the date — then the temperature there dropped into the upper 40s F a few hours later.<\/p>\n

\"MODIS<\/a>

MODIS Sea Surface Temperature product + Surface frontal analysis<\/p><\/div>\n

During the previous night-time hours, the southerly to southwesterly flow of unseasonably warm air (with dew points in the 50s F)<\/em> over the cold waters led to widespread lake fog across almost all of Lake Michigan, as was seen in a 03:22 UTC MODIS fog\/stratus product (below)<\/strong><\/em>.<\/p>\n

\"MODIS<\/a>

MODIS fog\/stratus product<\/p><\/div>\n

A few hours later (at 07:33 UTC),\u00c2\u00a0 isolated convective rain showers were moving across the southern half of Lake Michigan — these showed up at the darker gray to black enhanced features on the MODIS fog\/stratus product image (below)<\/strong><\/em>. The corresponding MODIS Instrument Flight Rules (IFR) and Low Instrument Flight Rules (LIFR) Probability products indicated a number of areas with IFR and\/or LIFR probabilities in excess of 80-90% (darker red color enhancement)<\/em>.<\/p>\n

\"MODIS<\/a>

MODIS fog\/stratus product + IFR Probability product + LIFR Probability product<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

250-meter resolution Terra and Aqua MODIS true-color Red\/Green\/Blue (RGB) images from the SSEC MODIS Today site (above) revealed the presence of an undular bore along the leading edge of a southward-moving cold front (also known regionally as a “pneumonia front“) on 15 March 2012. AWIPS images of the MODIS Sea Surface Temperature (SST) product (below) […]<\/p>\n","protected":false},"author":18,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[21,13,10,12,45],"tags":[],"class_list":["post-9985","post","type-post","status-publish","format-standard","hentry","category-aviation","category-fog-detection","category-general-interpretation","category-modis","category-redgreenblue-rgb-images"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/9985","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=9985"}],"version-history":[{"count":8,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/9985\/revisions"}],"predecessor-version":[{"id":9993,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/9985\/revisions\/9993"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=9985"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=9985"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=9985"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}