{"id":10112,"date":"2012-04-02T23:59:27","date_gmt":"2012-04-02T23:59:27","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=10112"},"modified":"2012-04-03T18:56:31","modified_gmt":"2012-04-03T18:56:31","slug":"intense-eastern-pacific-gulf-of-alaska-storm","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/10112","title":{"rendered":"Intense Eastern Pacific \/ Gulf of Alaska storm"},"content":{"rendered":"
\"GOES-15<\/a>

GOES-15 6.5 \u00c2\u00b5m water vapor channel images (click image to play animation)<\/p><\/div>\n

McIDAS images of 4-km resolution GOES-15 6.5 \u00c2\u00b5m water vapor channel data (above; click image to play animation)<\/em><\/strong> displayed the development of a classic “dry swirl” water vapor signature indicating the transition to an occluded cyclone during the 01 April – 02 April 2012<\/strong> time period. The Ocean Prediction Center was forecasting large areas of hurricane force winds associated with this storm (00 UTC<\/a><\/strong> | 06 UTC<\/a><\/strong> | 12 UTC<\/a><\/strong>).<\/p>\n

A sequence of AWIPS images of 1-km resolution MODIS 11.0 \u00c2\u00b5m and POES AVHRR 12.0 \u00c2\u00b5m IR channel data (below)<\/em><\/strong> showed a variery of small-scale banding structures during various stages of development of the storm.<\/p>\n

\"MODIS<\/a>

MODIS 11.0 \u00c2\u00b5m + POES AVHRR 12.0 \u00c2\u00b5m IR channel images<\/p><\/div>\n

The approach of a strong Potential Vorticity (PV) anomaly helped the storm to intensify rapidly, with with CRAS<\/a><\/strong> model fields indicating the tropopause (taken to be the pressure level of the PV1.5 surface)<\/em> lowering to around the 900 millibar level by 06 UTC on 02 April (below)<\/em><\/strong>.<\/p>\n

\"GOES-15<\/a><\/p>\n

Although the storm was near the edge of the GOES-15 sounder scan, an image of the GOES-15 sounder Total Column Ozone product (below)<\/em><\/strong> showed that the PV anomaly was situated along a strong ozone gradient (which is often the case).<\/p>\n

\"GOES-15<\/a>

GOES-15 6.5 \u00c2\u00b5m water vapor image + GOES-15 sounder Total Column Ozone product (with overlays of CRAS model PV1.5 pressure)<\/p><\/div>\n

The MIMIC Total Precipitable Water (TPW) product (below)<\/em><\/strong> showed the storm tapped an area of moisture that was situated north of the Hawaiian Islands, eventually stretching this moisture into a thin filament along the storm’s cold frontal boundary<\/a><\/strong>.<\/p>\n

\"MIMIC<\/a>

MIMIC Total Precipitable Water product (click image to play animation)<\/p><\/div>\n

Later in the day, an overpass of a EUMETSAT MetOp satellite provided ASCAT ocean surface winds over the large occluded storm as it was moving slowly off the coast of British Columbia, Canada. A comparison of 1-km resolution MODIS 0.65 \u00c2\u00b5m visible channel and MODIS 11.0 \u00c2\u00b5m IR channel images with an overlay of ASCAT wind vectors is shown below.<\/p>\n

\"MODIS<\/a>

MODIS 0.65 \u00c2\u00b5m visible channel and 11.0 \u00c2\u00b5m IR channel images + MetOp ASCAT scatterometer surface winds<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

McIDAS images of 4-km resolution GOES-15 6.5 \u00c2\u00b5m water vapor channel data (above; click image to play animation) displayed the development of a classic “dry swirl” water vapor signature indicating the transition to an occluded cyclone during the 01 April – 02 April 2012 time period. The Ocean Prediction Center was forecasting large areas of […]<\/p>\n","protected":false},"author":18,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[22,15,43,8,12,26,25],"tags":[],"class_list":["post-10112","post","type-post","status-publish","format-standard","hentry","category-avhrr","category-goes-sounder","category-goes-15","category-marine-weather","category-modis","category-poes","category-satellite-winds"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/10112","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=10112"}],"version-history":[{"count":9,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/10112\/revisions"}],"predecessor-version":[{"id":10121,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/10112\/revisions\/10121"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=10112"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=10112"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=10112"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}