{"id":16558,"date":"2014-08-24T23:59:08","date_gmt":"2014-08-24T23:59:08","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=16558"},"modified":"2014-08-28T20:02:21","modified_gmt":"2014-08-28T20:02:21","slug":"the-effect-of-wind-shear-on-tropical-storm-karina","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/16558","title":{"rendered":"The effect of wind shear on Tropical Storm Karina"},"content":{"rendered":"
\"GOES-15<\/a>

GOES-15 0.63 \u00b5m visible channel images (click to play Animated GIF)<\/p><\/div>\n

GOES-15 0.63 \u00b5m visible channel images (Animated GIF<\/strong><\/a> | MP4 movie<\/strong><\/a> | YouTube video<\/strong><\/a> | QuickTime movie<\/strong><\/a>) showed the decoupling of the upper-level and lower-level circulations of Tropical Storm Karina<\/strong><\/a> in the East Pacific Ocean on 24 August 2014. This decoupling was caused by strong wind shear along the western periphery of Category 5 Hurricane Marie, which was located to the east-southeast of Karina (large-scale view<\/strong><\/a>). Kudos to Dennis Chesters (NASA\/Goddard) for bringing this interesting case to our attention (and providing the QuickTime movie linked to above).<\/p>\n

The corresponding GOES-15 10.7 \u00b5m IR channel images (Animated GIF<\/strong><\/a> | MP4 movie<\/strong><\/a> | YouTube video<\/strong><\/a>) showed the cold clouds (red to black to white to purple color enhancement)<\/em> associated with the upper-level circulation moving northward and quickly dissipating; the signature of the warmer clouds (darker cyan color enhancement)<\/em> associated with the lower-level circulation can also be seen emerging from beneath the cold cloud shield and moving eastward.<\/p>\n

\"GOES-15<\/a>

GOES-15 10.7 \u00b5m IR channel images (click to play Animated GIF)<\/p><\/div>\n

A closer view provided by a Suomi NPP VIIRS true-color Red\/Green\/Blue (RGB) image from the SSEC RealEarth<\/strong><\/a> web map server (below)<\/strong><\/em> showed the separation of the upper-level and lower-level circulations around 21:53 UTC.<\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS true-color RGB image<\/p><\/div>\n

A sequence of 4 images (15, 18, 21, and 00 UTC) from the CIMSS Tropical Cyclones<\/strong><\/a> site (below)<\/strong><\/em> shows GOES-15 6.5 \u00b5m water vapor channel images with overlays of deep-layer wind shear (derived from satellite winds). To the east of Karina (which was located in the center of the images),<\/em> the large anticylcone aloft associated with Category 5 Hurricane Marie can be seen, with increasing vales of southeasterly wind shear moving over Karina.<\/p>\n

\"GOES-15<\/a>

15 UTC<\/strong> GOES-15 6.5 \u00b5m water vapor images with overlays of deep layer wind shear<\/p><\/div>\n

The 3 image comparisons below show the separation of the centers of upper-level divergence (yellow)<\/em> and lower-level convergence (cyan)<\/em> as the decoupling process was occurring at 18 UTC, 21 UTC, and 00 UTC.<\/p>\n

\"18<\/a>

18 UTC:<\/strong> GOES-15 6.5 \u00b5m water vapor image with upper-level divergence (yellow) and GOES-15 10.7 \u00b5m IR image with lower-level convergence (cyan)<\/p><\/div>\n

\"21<\/a>

21 UTC:<\/strong> GOES-15 6.5 \u00b5m water vapor image with upper-level divergence (yellow) and GOES-15 10.7 \u00b5m IR image with lower-level convergence (cyan)<\/p><\/div>\n

\"00<\/a>

00 UTC:<\/strong> GOES-15 6.5 \u00b5m water vapor image with upper-level divergence (yellow) and GOES-15 10.7 \u00b5m IR image with lower-level convergence (cyan)<\/p><\/div>\n

===== 25 August Update =====<\/strong><\/p>\n

\"GOES-15<\/a>

GOES-15 0.63 \u00b5m visible channel images, with Metop ASCAT surface scatterometer winds<\/p><\/div>\n

Even though the southeastward-moving low-level circulation of Karina had been downgraded to a Tropical Depression with 30 knot winds, there was still an impressive burst of convection just west of the center as it began to move back over warmer water<\/strong><\/a> on 25 August. Metop ASCAT surface scatterometer winds (above)<\/strong><\/em> showed a small pocket of winds in the 30.0-39.9 knot range (green wind barbs)<\/em> at 18:29 UTC.<\/p>\n

There were also some Tropical Overshooting Top (TOT) targets detected within the convective burst (below);<\/strong><\/em> TOT symbols: Red = 0-1 hour previous, Green = 1-2 hours previous, Blue = 2-3 hours previous.<\/p>\n

\"GOES-15<\/a>

GOES-15 Infrared – Water Vapor difference product, and Tropical Overshooting Tops product (TOT symbols: Red = 0-1 hour previous, Green = 1-2 hours previous, Blue = 2-3 hours previous)<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

GOES-15 0.63 \u00b5m visible channel images (Animated GIF | MP4 movie | YouTube video | QuickTime movie) showed the decoupling of the upper-level and lower-level circulations of Tropical Storm Karina in the East Pacific Ocean on 24 August 2014. This decoupling was caused by strong wind shear along the western periphery of Category 5 Hurricane […]<\/p>\n","protected":false},"author":18,"featured_media":16563,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[43,58,53,45,25,49,2,48],"tags":[],"class_list":["post-16558","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goes-15","category-metop","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\/16558","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=16558"}],"version-history":[{"count":13,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/16558\/revisions"}],"predecessor-version":[{"id":16600,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/16558\/revisions\/16600"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/16563"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=16558"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=16558"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=16558"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}