{"id":58235,"date":"2024-04-05T16:00:46","date_gmt":"2024-04-05T16:00:46","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=58235"},"modified":"2024-04-05T17:06:09","modified_gmt":"2024-04-05T17:06:09","slug":"gale-warnings-over-hawaii","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/58235","title":{"rendered":"Gale Warnings over Hawai’i"},"content":{"rendered":"\n
\"\"<\/a>
MetopB ASCAT winds, 0745, 0724 and 0703 UTC on 3, 4, 5 April, respectively, 2024 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

A series of Advanced Scatterometer (ASCAT) images (ascending passes) from Metop-B, above, show a large region of gale force winds surrounding the Hawai’ian Islands between 3 April and 5 April 2024. The entire island chain is under Wind Advisories or Gale Warnings; additionally, High Surf Advisories are in effect on the eastern sides of most islands as shown in the screen capture of the website of the Honolulu NWS Forecast Office <\/a>below. Small Craft Advisories are also widespread around the islands.<\/p>\n\n\n\n

\"\"<\/a>
Front Page of the Honolulu Forecast Office of the National Weather Service, 1535 UTC on 5 April 2024 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

The strong winds are Equatorward of an unusually strong Anticyclone (> 1050 mb!) that has been moving through the north-central Pacific Ocean as depicted in the GFS model output shown below (taken from this website<\/a>).<\/p>\n\n\n\n

\"\"<\/a>
6-h GFS forecasts valid every 12 hours from 12 UTC 2 April through 12 UTC 5 April 2024 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

Synthetic Aperture Radar (SAR) winds (source<\/a>), below, also show gale-force winds in\/around Hawai’ian islands, but the islands are blocking winds such that relatively calm regions extend for some distance downwind of the islands. (The lighter winds in the lee of the islands show up in the scatterometry fields shown above as well, most especially in the imagery from 4 April<\/a>).<\/p>\n\n\n\n

\"\"<\/a>
Sentinel-1A SAR winds, 0440 UTC on 5 April 2024 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n
\n\n\n\n

What do the waves look like? Altimetry data, below, shows slowly building Significant Wave Heights (defined as the average of the highest 1\/3rd of the wave heights) between 3 and 5 April 2024. (Imagery from here<\/a>)<\/p>\n\n\n\n

\"\"<\/a>
Altimetry data (Significant Wave Heights) from 3-5 April 2024 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

Observed waves (from this website<\/a>) north of Maui, below, and east of Kaneohe Bay, Oahu (bottom) also show building wave heights from 3-5 April.<\/p>\n\n\n\n

\"\"<\/a>
Wave observations north of Pauwela, Maui, 3-5 April 2024 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n
\"\"<\/a>
Wave observations east of Kaneohe Bay, Oahu, 3-5 April 2024 (Click to enlarge)<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"

A series of Advanced Scatterometer (ASCAT) images (ascending passes) from Metop-B, above, show a large region of gale force winds surrounding the Hawai’ian Islands between 3 April and 5 April 2024. The entire island chain is under Wind Advisories or Gale Warnings; additionally, High Surf Advisories are in effect on the eastern sides of most […]<\/p>\n","protected":false},"author":19,"featured_media":58244,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[58,104,25],"tags":[],"class_list":["post-58235","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-metop","category-sar","category-satellite-winds"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/58235","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=58235"}],"version-history":[{"count":8,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/58235\/revisions"}],"predecessor-version":[{"id":58258,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/58235\/revisions\/58258"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/58244"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=58235"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=58235"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=58235"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}