{"id":47243,"date":"2022-07-19T23:59:00","date_gmt":"2022-07-19T23:59:00","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=47243"},"modified":"2022-12-09T16:42:20","modified_gmt":"2022-12-09T16:42:20","slug":"anomalously-deep-upper-low-brings-snow-to-northwestern-alaska","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/47243","title":{"rendered":"Anomalously-deep upper low brings light snow to northwestern Alaska"},"content":{"rendered":"
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GOES-18 Mid-level (6.9 \u00b5m) Water Vapor images, with plots of hourly surface weather type [click to play animated GIF | MP4<\/strong><\/a>]<\/p><\/div>\n

GOES-18 images shown in this blog post are preliminary and non-operational<\/strong><\/p>\n

GOES-18 Mid-level Water Vapor (6.9 \u00b5m<\/strong><\/a>) images during the 18 July – 19 July 2022 period (above)<\/strong><\/em> showed a series of impulses rotating within the broader circulation of an anomalously-deep<\/a><\/strong> low pressure system that meandered over the Bering Strait<\/strong><\/a> region. Anomalously-cold<\/strong><\/a> air associated with this deep low helped to produce brief periods of unusual July snow at some locations across the Seward Peninsula and northwestern Alaska.<\/p>\n

In GOES-18 Air Mass RGB<\/strong><\/a> images created using Geo2Grid<\/strong><\/a> (below)<\/strong><\/em>, brighter shades of red highlighted the core of this broad low pressure system, where high-altitude ozone levels were elevated (due to an unusually low tropopause).<\/p>\n

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GOES-18 Air Mass RGB images [click to play animated GIF | MP4<\/strong><\/a>]<\/p><\/div>
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Plots of rawinsonde data at Nome, Alaska at 00 UTC and 12 UTC on 19 July 2022 [click to enlarge]<\/p><\/div>In fact, at 12 UTC on 19 July the low 500 hPa geopotential height value of 5269.3 meters from the Nome, Alaska rawinsonde report (above)<\/strong><\/em> established a new July record for that site. The 12 UTC sounding also suggested that the tropopause was located at an unusually low pressure level of 483 hPa — such a low tropopause height was supported by NOAA-20 Gridded NUCAPS data from the SPoRT site<\/strong><\/a> (below)<\/strong><\/em>.<\/p>\n

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NOAA-20 Gridded NUCAPS Tropopause Height at 1236 UTC on 19 July [click to enlarge]<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

GOES-18 images shown in this blog post are preliminary and non-operational GOES-18 Mid-level Water Vapor (6.9 \u00b5m) images during the 18 July – 19 July 2022 period (above) showed a series of impulses rotating within the broader circulation of an anomalously-deep low pressure system that meandered over the Bering Strait region. Anomalously-cold air associated with […]<\/p>\n","protected":false},"author":18,"featured_media":47293,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37,132,114,78,83,45,5],"tags":[],"class_list":["post-47243","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arctic","category-geo2grid","category-goes-18","category-noaa-20","category-nucaps","category-redgreenblue-rgb-images","category-winter-weather"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/47243","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=47243"}],"version-history":[{"count":14,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/47243\/revisions"}],"predecessor-version":[{"id":49090,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/47243\/revisions\/49090"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/47293"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=47243"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=47243"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=47243"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}