{"id":62262,"date":"2024-12-25T18:59:00","date_gmt":"2024-12-25T18:59:00","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=62262"},"modified":"2024-12-30T15:22:38","modified_gmt":"2024-12-30T15:22:38","slug":"radiation-fog-over-lake-mendota-in-southern-wisconsin","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/62262","title":{"rendered":"Radiation fog over Lake Mendota in southern Wisconsin"},"content":{"rendered":"
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GOES-19 True Color RGB (left) and Blowing Snow RGB (right), from 1431-1801 UTC on 25th December [click to play animated GIF | MP4<\/strong><\/a>]<\/p><\/div>\n

5-minute CONUS Sector GOES-19 (Preliminary\/Non-operational) True Color RGB and Blowing Snow RGB<\/strong><\/a> images created using Geo2Grid<\/strong><\/a> (above)<\/strong><\/em> displayed a small patch of radiation fog over Lake Mendota<\/strong><\/a> that slowly dissipated during the morning hours on 25th December 2024<\/strong><\/a> (the Blowing Snow RGB is a modified version of the Day Snow-Fog RGB<\/strong><\/a>, which uses higher spatial resolution Band 2<\/strong><\/a> imagery in place of Band 3<\/strong><\/a> as the Red component). Much of Lake Mendota was still ice-free (although some ice growth had occurred along parts of the shoreline) — but nocturnal radiational cooling allowed the surface air temperature at nearby airports to reach minimum values of 9\u00baF at Middleton (KC29)<\/strong><\/a> and 10\u00baF at Madison (KMSN)<\/strong><\/a>. The Lake Mendota fog did briefly move inland across the southern and western edges of the lake.<\/p>\n

5-minute GOES-16 (GOES-East)<\/em> Visible images (below)<\/strong><\/em> showed the fog dissipating over the western half of Lake Mendota as surface air temperatures began to warm after sunrise.<\/p>\n

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GOES-16 Red Visible (0.64 \u00b5m) images with surface reports with 15-minute METAR surface reports plotted in cyan, from 1431-1801 UTC on 25th December [click to play MP4 animation]<\/p><\/div>\n

UW-SSEC\/AOS<\/strong><\/a> north-facing rooftop camera images (below)<\/strong><\/em> revealed multiple incursions of the Lake Mendota fog into the University of Wisconsin – Madison campus, located just south of the lake (both before and after sunrise).<\/p>\n

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UW-SSEC\/AOS north-facing rooftop camera images [click to play MP4 animation]<\/p><\/div>\n

Thanks to Tim Schmit (NOAA\/NESDIS\/STAR) for bringing this interesting case to our attention (and also taking ground truth photo1<\/strong><\/a> and photo2<\/strong><\/a> of the fog on campus).<\/p>\n\n\n

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Local #fog<\/a> advection https:\/\/t.co\/K4d9vjINEK<\/a>; ?@NOAASatellites<\/a>? #GOES16<\/a> Madison #WIwx<\/a> ?@UWSSEC<\/a>? ?@UWCIMSS<\/a>? pic.twitter.com\/njAjw4T97w<\/a><\/p>— Tim Schmit (@GOESguy) December 25, 2024<\/a><\/blockquote>