{"id":19968,"date":"2015-11-02T02:31:53","date_gmt":"2015-11-02T02:31:53","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=19968"},"modified":"2015-11-07T19:42:17","modified_gmt":"2015-11-07T19:42:17","slug":"cyclone-chapala-approaches-yemen","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/19968","title":{"rendered":"Cyclone Chapala approaches Yemen"},"content":{"rendered":"
\"METOP-B<\/a>

METOP-B Imagery (0.63 \u00b5m Visible and 10.8 \u00b5m Infrared) over Chapala, ~0615 UTC on 2 November 2015<\/strong> (Click to enlarge)<\/p><\/div>\n

Cyclone Chapala continued its unusual approach towards Yemen on the southwestern edge of the Arabian Peninsula. Early on 2 November, the storm has passed just north of the Island of Socotra and entered the Gulf of Aden. METOP-B overflew the storm at ~0615 UTC on 2 November; Visible and Infrared data, above, show a still-compact storm with an obvious eye ringed by cold cloud tops (the coldest brightness temperatures are near -75\u00ba C) tucked into the mouth of the Gulf of Aden. Wind shear<\/a> in the region is very low and sea-surface temperatures<\/a> are warm. The morphed microwave imagery, below (taken from this site<\/a>), indicates that the eyewall brushed the island of Socotra as it passed (a comparison of Meteosat-7 Infrared and DMSP SSMIS microwave images around 15 UTC on 01 November can be seen here<\/a>).<\/p>\n

\"Morphed<\/a>

Morphed Microwave Imagery ending 1645 UTC 01 November 2015<\/strong> (Click to enlarge)<\/p><\/div>\n

Subsequent microwave imagery, below, for the 24 hours ending 1200 UTC on 2 November (the image below overlaps the one above) show a decrease in the eyewall structure and intensity.<\/p>\n

\"Morphed<\/a>

Morphed Microwave Imagery ending 1200 UTC 02 November 2015<\/strong> (Click to enlarge)<\/p><\/div>\n

Satellite-based intensity estimates at around 0000 UTC on 2 November (link<\/a>) suggest a central mean sea-level pressure around 940 mb with sustained winds near 120 knots. The 0000 UTC Meteosat-7 image is shown below.<\/p>\n

\"Meteosat-7<\/a>

Meteosat-7 Window Channel Infrared (11.5 \u00b5m) 0000 UTC, 2 November 2015<\/strong> (Click to enlarge)<\/p><\/div>\n

Suomi NPP overflew the region shortly after 2100 UTC on 1 November, and the Day\/Night Band<\/a> imagery from VIIRS is shown below, toggled with the 11.45 \u00b5m Infrared imagery<\/a>. The storm is centered just northwest of Socotra; mesovortices are evident within the eye, as are overshooting tops in the eyewall convection; the bright streak seen on the Day\/Night Band image is a region of the western eyewall illuminated by intense lightning activity. Zoomed-out versions of the imagery are available here for Day\/Night Band<\/a> and here for 11.45 \u00b5m Infrared<\/a>. (VIIRS Imagery courtesy William Straka, SSEC\/CIMSS).<\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS Day\/Night Band Visible Image and 11.45 \u00b5m Infrared Image 2149 UTC, 2 November 2015<\/strong> (Click to enlarge)<\/p><\/div>\n

A comparison of Meteosat-7 Infrared and DMSP SSMIS Microwave images around 1530 UTC on 2 November, below, showed the northern edge of the eyewall very near to the coast of Yemen.<\/p>\n

\"Meteosat-7<\/a>

Meteosat-7 Infrared and DMSP SSMIS Microwave images<\/strong> (click to enlarge)<\/p><\/div>\n

At landfall, below, as viewed by Suomi NPP’s VIIRS instrument and a timely overpass, the eye of the storm had filled. The change in storm structure prior to landfall was very apparent in this toggle of two METOP Infrared images<\/a>, at 0558 and 1644 UTC on 2 November. However, Meteosat-7 Infrared images<\/a> showed that there was a large convective burst that developed as Chapala made landfall. Chapala was the first tropical cyclone on record to make landfall in Yemen while still at hurricane intensity.<\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS I05 (11.45) Infrared Image, 2127 UTC on 2 November<\/strong> (click to enlarge)<\/p><\/div>A 6-day animation of the storm using VIIRS true-color imagery from RealEarth<\/a> can be seen here<\/a>. Cyclone Chapala is also discussed in this blog post<\/a>.<\/p>\n

===== 05 November Update =====<\/p>\n

A 14-day animation of UK Met Office OSTIA<\/a> Sea Surface Temperature, below, reveals the cold wake of upwelling water (yellow color enhancement) following the passage of Hurricane Chapala.<\/p>\n

\"UK<\/a>

UK Met Office OSTIA Sea Surface Temperature analyses<\/strong> [click to enlarge]<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

Cyclone Chapala continued its unusual approach towards Yemen on the southwestern edge of the Arabian Peninsula. Early on 2 November, the storm has passed just north of the Island of Socotra and entered the Gulf of Aden. METOP-B overflew the storm at ~0615 UTC on 2 November; Visible and Infrared data, above, show a still-compact […]<\/p>\n","protected":false},"author":19,"featured_media":19989,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[56,30,23,58,47,53,45,25,49,2,48],"tags":[],"class_list":["post-19968","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dmsp","category-lightning","category-meteosat","category-metop","category-other-satellites","category-real-earth","category-redgreenblue-rgb-images","category-satellite-winds","category-suomi_npp","category-tropical-cyclones","category-viirs"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/19968","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=19968"}],"version-history":[{"count":45,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/19968\/revisions"}],"predecessor-version":[{"id":20026,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/19968\/revisions\/20026"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/19989"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=19968"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=19968"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=19968"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}