{"id":50425,"date":"2023-02-12T23:59:00","date_gmt":"2023-02-12T23:59:00","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=50425"},"modified":"2023-02-14T03:56:38","modified_gmt":"2023-02-14T03:56:38","slug":"strong-winds-causing-heavy-freezing-spray-off-the-alaska-coast","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/50425","title":{"rendered":"Strong winds causing heavy freezing spray off the Alaska coast"},"content":{"rendered":"

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GOES-18 “Red” Visible (0.64 \u00b5m) images, with and without plots of Derived Motion Winds [click to play animated GIF | MP4<\/strong><\/a>]<\/p><\/div>1-minute Mesoscale Domain Sector GOES-18 (GOES-West)<\/em> “Red” Visible (0.64 \u00b5m) images (above)<\/strong><\/em> include plots of Derived Motion Winds<\/strong><\/a> (DMW) — and showed the rapid offshore transport of cold arctic air across the southern Cook Inlet<\/strong><\/a>, Shelikof Strait<\/strong><\/a> and northwestern Gulf of Alaska<\/strong><\/a> on 12 February 2023. The fastest low-level (Surface – 900 hPa) DMW speed was 64 knots in the far southern portion of Cook Inlet at 2305 UTC (below)<\/strong><\/em>.<\/p>\n

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GOES-18 “Red” Visible (0.64 \u00b5m) image at 2305 UTC, with plots of Derived Motion Winds (DWM) and a cursor readout showing a 64-knot DMW wind speed [click to enlarge]<\/p><\/div>
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Heavy Freezing Spray Warning issued for the Shelikof Strait [click to enlarge]<\/p><\/div>A Heavy Freezing Spray Warning had been issued for that entire offshore region (light blue), including the Shelikof Strait (above)<\/strong><\/em> — and Buoy 46077<\/strong><\/a> in the Shelikof Strait was recording Ice Accretion rates in excess of 1.0 inches per hour (below)<\/strong><\/em>. Buoy air temperatures<\/strong><\/a> had fallen into the 10-12F range during that time, with wind gusts<\/strong><\/a> of 40-50 knots — providing ideal conditions for rapid ice accretion.<\/p>\n

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Plot of Buoy 46077 Ice Accretion Rates<\/p><\/div>\n

RCM\/Radarsat-2 SAR winds at 1630 UTC on 12 February (source<\/strong><\/a>) are shown below — a NW-to-SE oriented swath of strong offshore winds (40-50 knots, darker shades of red) was seen extending from the far southern end of Cook Inlet (where the aforementioned 64-knot GOES-18 DMW speed was located) into the northwestern Gulf of Alaska. Another pocket of similarly-strong wind speeds was evident farther to the north, in the vicinity of Homer<\/strong><\/a>, Homer Spit and the mouth of Kachemak<\/strong> Bay<\/strong><\/a>.<\/p>\n

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RCM\/Radarsat-2 SAR winds at 1630 UTC on 12 February [click to enlarge]<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

1-minute Mesoscale Domain Sector GOES-18 (GOES-West) “Red” Visible (0.64 \u00b5m) images (above) include plots of Derived Motion Winds (DMW) — and showed the rapid offshore transport of cold arctic air across the southern Cook Inlet, Shelikof Strait and northwestern Gulf of Alaska on 12 February 2023. The fastest low-level (Surface – 900 hPa) DMW speed […]<\/p>\n","protected":false},"author":18,"featured_media":50450,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[114,8,104,25,5],"tags":[],"class_list":["post-50425","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goes-18","category-marine-weather","category-sar","category-satellite-winds","category-winter-weather"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/50425","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=50425"}],"version-history":[{"count":13,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/50425\/revisions"}],"predecessor-version":[{"id":50465,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/50425\/revisions\/50465"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/50450"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=50425"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=50425"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=50425"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}