{"id":60751,"date":"2024-09-07T02:39:35","date_gmt":"2024-09-07T02:39:35","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=60751"},"modified":"2024-09-07T04:18:47","modified_gmt":"2024-09-07T04:18:47","slug":"gremlin-radar-estimates-over-american-samoa","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/60751","title":{"rendered":"GREMLIN radar estimates over American Samoa"},"content":{"rendered":"\n
\"\"<\/a>
GOES-18 Visible Imagery (Band 2, 0.64 \u00b5m) 1930-2110 UTC on 6 September 2024 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

GOES-18 Visible imagery, above, over the Samoan Islands, shows a variety of cloud structures moving from north to south over the Samoan Islands, especially over the smaller islands of American Samoa (Tutuila, Ofu\/Olosega and Ta’u). The animation below, covering about the same time span, shows GREMLIN radar estimates. GREMLIN is a Machine-Learning tool the predicts radar returns based on ABI and GLM observations. Although it was trained on CONUS imagery, it does provide actionable information over the tropical South Pacific.<\/p>\n\n\n\n

\"\"<\/a>
GOES-18 GREMLIN radar estimates 1920-2110 UTC on 6 September 2024 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n
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View to the east of the NWS Office at the Pago Pago airport on Tutuila, 1027 AM SST\/2127 UTC (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

The view to the east of the Pago Pago airport, above, at 2127 UTC, shows the lower ceilings associated with the heavy rain. GREMLIN did a great job on this day of predicting onset and cessation of rains during a day when Flash Flood Warnings were issued (at 2208 UTC<\/a>).<\/p>\n\n\n\n

\n\n\n\n

A second Flash Flood warning was issued later in the day, and the run-up to that warning is shown in the animation below, visible imagery from 0050 to 0240 UTC on 7 September, below, and GREMLIN imagery from 0040 to 0230 UTC, at bottom.<\/p>\n\n\n\n

\"\"<\/a>
GOES-18 Visible Imagery (Band 2, 0.64 \u00b5m) 0050-0240 UTC on 7 September 2024 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n
\"\"<\/a>
GOES-18 GREMLIN 0040-0230 UTC on 7 September 2024 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

The Forecast Office in Pago Pago had a Facebook post<\/a> (below) that included one of the GREMLIN images above highlighting a Flash Flood warning<\/a> issued at 0249 UTC on 7 September.<\/p>\n\n\n\n

\"\"<\/a>
Facebook post from NWS Pago Pago (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n
\n\n\n\n

Thanks to Jane Allen and Dora Meredith, NWS Pago Pago, for the AWIPS imagery!<\/p>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

GOES-18 Visible imagery, above, over the Samoan Islands, shows a variety of cloud structures moving from north to south over the Samoan Islands, especially over the smaller islands of American Samoa (Tutuila, Ofu\/Olosega and Ta’u). The animation below, covering about the same time span, shows GREMLIN radar estimates. GREMLIN is a Machine-Learning tool the predicts […]<\/p>\n","protected":false},"author":19,"featured_media":60757,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[114,16],"tags":[],"class_list":["post-60751","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goes-18","category-heavy-rain-flooding"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/60751","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=60751"}],"version-history":[{"count":5,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/60751\/revisions"}],"predecessor-version":[{"id":60766,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/60751\/revisions\/60766"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/60757"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=60751"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=60751"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=60751"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}