{"id":1826,"date":"2009-01-22T20:39:34","date_gmt":"2009-01-22T20:39:34","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=1826"},"modified":"2009-01-23T18:45:18","modified_gmt":"2009-01-23T18:45:18","slug":"freeze-in-florida","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/1826","title":{"rendered":"Freeze in Florida"},"content":{"rendered":"
\"MODIS<\/a>

MODIS 11.0 \u00c2\u00b5m IR + GOES-12 10.7 \u00c2\u00b5m IR + GOES-12 sounder Skin Temperature<\/p><\/div>\n

Much of the central and southern Florida peninsula experienced temperatures at or below freezing<\/strong><\/a> on the morning of 22 January 2009<\/strong><\/a>. Surface air temperatures were as cold as 15\u00c2\u00ba F at Archbold<\/strong> in the Tampa NWS County Warning Area (CWA), 16\u00c2\u00ba F at Plymouth<\/strong> in the Melbourne CWA, and 23\u00c2\u00ba F at Palmdale<\/strong> in the Miami CWA. A comparison of AWIPS images of the 1-km resolution MODIS 11.0 \u00c2\u00b5m IR window channel, the 4-km resolution GOES-12 10.7 \u00c2\u00b5m IR window channel, and the 10-km resolution GOES-12 sounder Skin Temperature product (above)<\/strong><\/em> showed that IR brightness temperatures and sounder skin temperature values of 32\u00c2\u00ba F and colder (cyan to blue to purple colors)<\/em> extended well south of Lake Okeechobee at 07:15 UTC (3:15 AM local time)<\/em>. The coldest MODIS IR \/ GOES-12 IR \/ GOES-12 Skin Temperature values at that time were -11.5\u00c2\u00ba C (11.3\u00c2\u00ba F) \/ -9.0\u00c2\u00ba C (15.8\u00c2\u00ba F) \/ -5.5\u00c2\u00ba C (22.1\u00c2\u00ba F), respectively.<\/p>\n

An AWIPS image of the 1-km resolution MODIS Land Surface Temperature (LST) product over central Florida\u00c2\u00a0 (below)<\/strong><\/em> revealed that the coldest LST values of 17.3 \u00c2\u00ba F (purple color enhancement)<\/em> were found just southwest of Leesburg (station identifier KLEE), along the border of Lake county and Sumter county.<\/p>\n

\"MODIS<\/a>

MODIS Land Surface Temperature product (central Florida)<\/p><\/div>\n

The MODIS Land Surface Temperature product over southern Florida (below) <\/strong><\/em>showed that LST values of 32\u00c2\u00ba F and colder (darker blue color enhancement)<\/em> were found as far south as the area east of\u00c2\u00a0 Naples (station identifier KAPF)<\/em>. Note the relative warmth of Lake Okeechobee, were LST values of 55-56\u00c2\u00ba F (red color enhancement)<\/em> were seen.<\/p>\n

\"MODIS<\/a>

MODIS Land Surface Temperature product (southern Florida)<\/p><\/div>\n

An animation of the GOES-12 10.7 \u00c2\u00b5m IR window imagery (below)<\/strong><\/em> showed the southward progression of below-freezing surface IR brightness temperatures during the night-time hours, as well as the warming of the Florida peninsula after sunrise on 22 January.<\/p>\n

\"GOES-12<\/a>

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

\"GOES-12<\/a>

GOES-12 water vapor and IR images<\/p><\/div>\n

The air mass over Florida was dry enough to allow the 7.4 \u00c2\u00b5m water vapor channel on the GOES-12 sounder to actually sense the surface (above; animation<\/a>)<\/strong><\/em> — in this case, the\u00c2\u00a0weighting function<\/a><\/strong> (below)<\/em><\/strong> for the 7.4 \u00c2\u00b5m water vapor channel (red plot)<\/em> peaked at a very low altitude, allowing the thermal signal of the contrast between cold land and warm ocean to reach the satellite.<\/p>\n

\"GOES-12<\/a>

GOES-12 weighting functions (calculated using Miami rawinsonde data)<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

Much of the central and southern Florida peninsula experienced temperatures at or below freezing on the morning of 22 January 2009. Surface air temperatures were as cold as 15\u00c2\u00ba F at Archbold in the Tampa NWS County Warning Area (CWA), 16\u00c2\u00ba F at Plymouth in the Melbourne CWA, and 23\u00c2\u00ba F at Palmdale in the […]<\/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":[15,19,12,5],"tags":[],"class_list":["post-1826","post","type-post","status-publish","format-standard","hentry","category-goes-sounder","category-goes-12","category-modis","category-winter-weather"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/1826","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=1826"}],"version-history":[{"count":11,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/1826\/revisions"}],"predecessor-version":[{"id":1837,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/1826\/revisions\/1837"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=1826"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=1826"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=1826"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}