{"id":48536,"date":"2022-10-28T23:59:00","date_gmt":"2022-10-28T23:59:00","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=48536"},"modified":"2022-11-01T18:00:25","modified_gmt":"2022-11-01T18:00:25","slug":"hurricane-force-low-in-the-southern-bering-sea","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/48536","title":{"rendered":"Hurricane Force low in the southern Bering Sea"},"content":{"rendered":"

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GOES-18 Air Mass RGB images, with plots of hourly surface reports [click to play animated GIF | MP4<\/strong><\/a>]<\/p><\/div>An anomalously-deep<\/strong><\/a> Hurricane Force low (surface analyses<\/strong><\/a>) moved eastward across the southern Bering Sea and eastern Aleutian Islands on 28 October 2022. GOES-18 (GOES-West)<\/em> Air Mass<\/strong><\/a> RGB images (above)<\/strong><\/em> included plots of hourly surface reports — which showed some of the strong winds produced by this storm. Peak wind gusts included 75 knots \/ 86 mph<\/strong><\/a> at Dutch Harbor (PADU, at 0309 UTC on 29 October), 68 knots \/ 78 mph<\/strong><\/a> at Akutan (PAUT, at 0455 UTC on 29 October), 61 knots \/ 70 mph<\/strong><\/a> at St. George (PAPB, at 2140 UTC on 28 October, as heavy snow was being reported), 59\u00a0 knots \/ 68 mph<\/strong><\/a> at Atka (PAAK, at 1645 UTC on 28 October) and 58 knots \/ 67 mph<\/strong><\/a> at Buoy 46073<\/strong><\/a> (at 2200 UTC on 28 October). The 75 knot \/ 86 mph gust at Dutch Harbor and the 68 knot \/ 78 mph gust at Akutan occurred around the time that anomalously-strong 925 hPa winds<\/strong><\/a> were moving south-southeastward across the eastern Aleutian Islands (along the western and southwestern edge of the low pressure center).<\/p>\n

The orange-to-red hues seen in the Air Mass RGB imagery indicated the presence of dry, ozone-rich stratospheric air within the upper portion of the atmospheric column (due to a lowering tropopause) — and AK-NAM40 model fields (below)<\/strong><\/em> suggested that the “dynamic tropopause<\/strong><\/a>” (taken to be the pressure of the PV1.5 surface) descended to the 600-675 hPa pressure level just south of the low pressure center.<\/p>\n

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GOES-18 Air Mass RGB images, with contours of AK-NAM40 model PV1.5 pressure [click to play animated GIF | MP4<\/strong><\/a>]<\/p><\/div>Gridded NUCAPS Tropopause Height (derived using Metop-B and Metop-C CrIS\/ATMS data) from the NASA SPoRT<\/strong><\/a> site (below)<\/strong><\/em> showed a narrow corridor of tropopause pressures near 600 hPa (brighter red enhancement) over and just north of the eastern Aleutians at 2108 and 2200 UTC — in general agreement with the AK-NAM40 model fields.<\/p>\n

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Gridded NUCAPS Tropopause Height [click to enlarge]<\/p><\/div>
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GOES-18 Air Mass RGB image at 1800 UTC, with contours of AK-NAM40 model PV1.5 pressure and Baseline B-B’ [click to enlarge]<\/p><\/div>On the 1800 UTC Air Mass RGB image, a northwest-to-southeast oriented cross section line (Baseline B-B’) was positioned through the area of highest PV1.5 pressure values (above).<\/strong><\/em> The Baseline B-B’ cross section of model wind speed, potential vorticity and specific humidity (below)<\/strong><\/em> displayed a tropopause fold, as the dry air and high potential vorticity characteristic of stratospheric air descended southeastward around the upper-tropospheric 140-knot jet streak axis.<\/p>\n

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Cross section of AK-NAM40 model fields along Baseline B-B’, valid at 1800 UTC [click to enlarge]<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

An anomalously-deep Hurricane Force low (surface analyses) moved eastward across the southern Bering Sea and eastern Aleutian Islands on 28 October 2022. GOES-18 (GOES-West) Air Mass RGB images (above) included plots of hourly surface reports — which showed some of the strong winds produced by this storm. Peak wind gusts included 75 knots \/ 86 […]<\/p>\n","protected":false},"author":18,"featured_media":48540,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[114,83,45],"tags":[],"class_list":["post-48536","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goes-18","category-nucaps","category-redgreenblue-rgb-images"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/48536","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=48536"}],"version-history":[{"count":28,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/48536\/revisions"}],"predecessor-version":[{"id":48577,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/48536\/revisions\/48577"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/48540"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=48536"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=48536"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=48536"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}