{"id":26155,"date":"2017-11-19T03:09:09","date_gmt":"2017-11-19T03:09:09","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=26155"},"modified":"2017-11-23T00:00:04","modified_gmt":"2017-11-23T00:00:04","slug":"alaskas-first-40of-temperature-of-the-2017-2018-winter-season","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/26155","title":{"rendered":"Alaska’s first -40\u00ba temperature of the 2017-2018 winter season"},"content":{"rendered":"

\"NOAA-18<\/a>

NOAA-18 Infrared Window (10.8 mm) image, with surface identifiers and air temperatures plotted in red [click to enlarge]<\/p><\/div>Alaska’s first (official) surface air temperature of -40\u00ba or colder for the 2017-2018 winter season was reported by the Cooperative Observer at Chicken (-43\u00baF)<\/strong><\/a> on 19 November 2017. A NOAA-18 Infrared Window (10.8 \u00b5m) image at 0320 UTC (above)<\/strong><\/em> showed cold air drainage into river valleys, with the coldest infrared brightness temperatures around -40\u00baC\/-40\u00baF (darker blue color enhancement)<\/em>. Chicken is located about midway between Eagle (PAEG) and Northway (PAOR), where 03 UTC surface air temperatures were -17\u00baF and -24\u00baF, respectively. However, PAEG<\/strong><\/a> reached their minimum temperature around 11 UTC after additional hours of cloud-free radiational cooling.<\/p>\n

An automated RAWS site at Chicken reached a minimum temperature of -34\u00baF at 1120 UTC<\/strong><\/a> — the dew point at that time was -42\u00baF. However, a MesoWest<\/strong><\/a> map (below)<\/strong><\/em> shows that the RAWS tower is located on a small hill (at an elevation of 2060 feet) — and the Cooperative Observer instrument shelter was likely located in the lower elevations of the settlement.<\/p>\n

\"MesoWest<\/a>

MesoWest map showing the location of the Chicken RAWS site [click to enlarge]<\/p><\/div>For comparison, note the 2011-2012<\/strong><\/a> and 2010-2011<\/strong><\/a> winter seasons.<\/p>\n","protected":false},"excerpt":{"rendered":"

Alaska’s first (official) surface air temperature of -40\u00ba or colder for the 2017-2018 winter season was reported by the Cooperative Observer at Chicken (-43\u00baF) on 19 November 2017. A NOAA-18 Infrared Window (10.8 \u00b5m) image at 0320 UTC (above) showed cold air drainage into river valleys, with the coldest infrared brightness temperatures around -40\u00baC\/-40\u00baF (darker […]<\/p>\n","protected":false},"author":18,"featured_media":26163,"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-26155","post","type-post","status-publish","format-standard","has-post-thumbnail","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\/26155","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=26155"}],"version-history":[{"count":7,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/26155\/revisions"}],"predecessor-version":[{"id":26172,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/26155\/revisions\/26172"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/26163"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=26155"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=26155"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=26155"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}