{"id":7258,"date":"2010-11-30T21:25:27","date_gmt":"2010-11-30T21:25:27","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=7258"},"modified":"2017-11-21T14:05:39","modified_gmt":"2017-11-21T14:05:39","slug":"the-first-40%c2%ba-f-40%c2%ba-c-temperatures-of-the-season-up-in-alaska","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/7258","title":{"rendered":"The first -40\u00ba F (-40\u00ba C) temperatures of the season in Alaska"},"content":{"rendered":"<div style=\"width: 650px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2010\/11\/101130_N15_CH04.GIF\"><img loading=\"lazy\" decoding=\"async\" class=\"\" title=\"NOAA-15 AVHRR 10.8 \u00c2\u00b5m IR image (with surface air temperatures)\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2010\/11\/101130_N15_CH04.GIF\" alt=\"NOAA-15 AVHRR 10.8 \u00c2\u00b5m IR image (with surface air temperatures)\" width=\"640\" height=\"480\" \/><\/a><p class=\"wp-caption-text\">NOAA-15 AVHRR 10.8 \u00c2\u00b5m IR image (with surface air temperatures)<\/p><\/div>\n<p>The first -40\u00ba F (-40\u00ba C) or colder surface air temperatures of the 2010-2011 winter season occurred on <strong>30 November 2010<\/strong> <em>(the last day of the 2010 Atlantic Ocean Tropical Cyclone Season)<\/em>. A McIDAS image of NOAA-15 AVHRR 10.8 \u00b5m IR channel data <em><strong>(above)<\/strong><\/em> shows a signal of the coldest air <em>(darker blue color enhancement)<\/em> draining into the lower elevations of the river valleys and the Yukon Flats region. At Fort Yukon <em>(station identifier PFYU),<\/em> the daily maximum and minimum temperatures were -36\u00ba F (-38\u00ba C) and -42\u00ba F (-41\u00ba C), respectively. In contrast to the areas of very cold surface temperatures, cloud features exhibited much warmer IR brightness temperatures <em>(green to yellow color enhancement)<\/em>.<\/p>\n<p>Note the significantly warmer surface air temperatures at a few sites along the arctic coast of both Alaska and the Yukon Territory of Canada &#8212; this was due to a low cloud deck that was preventing the strong radiational cooling that was occurring farther inland. AWIPS images of the <strong><a title=\"POES\/AVHRR in AWIPS: VISIT training lesson\" href=\"http:\/\/rammb.cira.colostate.edu\/training\/visit\/training_sessions\/poes_and_avhrr_satellite_products_in_awips\/\">POES AVHRR<\/a><\/strong> Cloud Top Temperature (CTT) product and the POES AVHRR Cloud Top Height (CTH) product <em><strong>(below)<\/strong><\/em> showed that CTT values associated with this feature were in the -20\u00ba to -25\u00ba C range\u00a0 <em>(yellow to cyan color enhancement)<\/em>, with CTH values of 1-2 km <em>(violet color enhancement)<\/em>.<\/p>\n<div style=\"width: 649px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2010\/11\/AVHRR_CTT_20101130_1603.png\"><img loading=\"lazy\" decoding=\"async\" class=\"\" title=\"POES AVHRR Cloud Top Temperature product\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2010\/11\/AVHRR_CTT_20101130_1603.png\" alt=\"POES AVHRR Cloud Top Temperature product\" width=\"639\" height=\"611\" \/><\/a><p class=\"wp-caption-text\">POES AVHRR Cloud Top Temperature product<\/p><\/div>\n<div style=\"width: 649px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2010\/11\/AVHRR_CLD_HGT_20101130_1603.png\"><img loading=\"lazy\" decoding=\"async\" class=\"\" title=\"POES AVHRR Cloud Top Height product\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2010\/11\/AVHRR_CLD_HGT_20101130_1603.png\" alt=\"POES AVHRR Cloud Top Height product\" width=\"639\" height=\"611\" \/><\/a><p class=\"wp-caption-text\">POES AVHRR Cloud Top Height product<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>The first -40\u00ba F (-40\u00ba C) or colder surface air temperatures of the 2010-2011 winter season occurred on 30 November 2010 (the last day of the 2010 Atlantic Ocean Tropical Cyclone Season). A McIDAS image of NOAA-15 AVHRR 10.8 \u00b5m IR channel data (above) shows a signal of the coldest air (darker blue color enhancement) [&hellip;]<\/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":[37,22,26,5],"tags":[],"class_list":["post-7258","post","type-post","status-publish","format-standard","hentry","category-arctic","category-avhrr","category-poes","category-winter-weather"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/7258","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=7258"}],"version-history":[{"count":8,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/7258\/revisions"}],"predecessor-version":[{"id":26158,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/7258\/revisions\/26158"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=7258"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=7258"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=7258"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}