{"id":44343,"date":"2022-01-21T19:12:43","date_gmt":"2022-01-21T19:12:43","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=44343"},"modified":"2022-01-21T19:53:16","modified_gmt":"2022-01-21T19:53:16","slug":"atmospheric-river-affecting-alaska","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/44343","title":{"rendered":"Atmospheric River affecting Alaska"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2022\/01\/mimictpw_alaska_24hEnding1700UTC_21January2022.gif\"><img loading=\"lazy\" decoding=\"async\" width=\"1040\" height=\"576\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2022\/01\/mimictpw_alaska_24hEnding1700UTC_21January2022.gif\" alt=\"\" class=\"wp-image-44344\" \/><\/a><figcaption>MIMIC Total Precipitable Water estimates, 1800 UTC on 20 January &#8211; 1700 UTC on 21 January 2022 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n<p><a href=\"http:\/\/tropic.ssec.wisc.edu\/real-time\/mtpw2\/product.php?color_type=tpw_nrl_colors&amp;prod=alaska&amp;timespan=24hrs&amp;anim=html5\">MIMIC Total Precipitable Water<\/a> fields for the 24 hours ending 1700 UTC on 21 January, above, show abundant moisture flowing into southern Alaska.  Hourly GOES-17 infrared imagery (Band 13 clean window infrared imagery at 10.3 \u00b5m), below, shows a large cyclonic circulation to the south and west of Alaska that is helping to draw moisture towards the state.  Level 2 Total Precipitable Water (TPW) is overlain on the imagery and two things stand out:  because it is a clear-sky only product, and because the north Pacific Ocean is very cloudy on the 21st, there is little TPW information.  Also, GOES-R Total Precipitable Water is not completely Full Disk; TPW is computed to a Local Zenith Angle of 67<sup>o<\/sup> (<a href=\"https:\/\/www.star.nesdis.noaa.gov\/goesr\/documents\/ATBDs\/Baseline\/ATBD_GOES-R_Sounding_LAP_v3.0_July2012.pdf\">ATBD<\/a>) and you can see the cut-off for the product in northwestern Canada.  Those two things argue for the utility of microwave detection of moisture over Alaska, as shown above.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2022\/01\/GOESCleanWindowTPW-20220121_1200_to_1700stepanim.gif\"><img loading=\"lazy\" decoding=\"async\" width=\"1129\" height=\"720\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2022\/01\/GOESCleanWindowTPW-20220121_1200_to_1700stepanim.gif\" alt=\"\" class=\"wp-image-44345\" \/><\/a><figcaption>GOES-17 Clean Window (10.3 \u00b5m, Band 13), hourly from 1200 &#8211; 1700 UTC on 21 January 2022, overlain with GOES-17 Level 2 Total Precipitable Water (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n<p>Much of Alaska Southeast from Yakutat to Wrangell is under a Flood Watch. (<a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2022\/01\/NWSFloodWatch_1800UTC_21January.png\">Image<\/a>, taken from <a href=\"https:\/\/www.weather.gov\/arh\/\">this site<\/a>)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MIMIC Total Precipitable Water fields for the 24 hours ending 1700 UTC on 21 January, above, show abundant moisture flowing into southern Alaska. Hourly GOES-17 infrared imagery (Band 13 clean window infrared imagery at 10.3 \u00b5m), below, shows a large cyclonic circulation to the south and west of Alaska that is helping to draw moisture [&hellip;]<\/p>\n","protected":false},"author":19,"featured_media":44344,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[80,16,79],"tags":[],"class_list":["post-44343","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goes-17","category-heavy-rain-flooding","category-microwave"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/44343","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\/19"}],"replies":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/comments?post=44343"}],"version-history":[{"count":4,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/44343\/revisions"}],"predecessor-version":[{"id":44350,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/44343\/revisions\/44350"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/44344"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=44343"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=44343"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=44343"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}