{"id":13569,"date":"2013-07-31T23:45:30","date_gmt":"2013-07-31T23:45:30","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=13569"},"modified":"2013-08-02T02:13:25","modified_gmt":"2013-08-02T02:13:25","slug":"convective-outflow-boundary-initiates-new-convection-over-kansas","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/13569","title":{"rendered":"Convective outflow boundary initiates new convection over Kansas"},"content":{"rendered":"
\"GOES-13<\/a>

GOES-13 0.63 \u00c2\u00b5m visible channel images (click image to play animation)<\/p><\/div>\n

AWIPS images of 1-km resolution GOES-13 0.63 \u00c2\u00b5m visible channel data (above; click image to play animation)<\/strong><\/em> showed an undular bore marking a surface-based convective outflow boundary which formed over southwestern Nebraska early in the day on 31 July 2013<\/strong><\/a> — this outflow boundary then propagated southwestward during the day and acted as a focus for the formation of severe thunderstorms over southwestern Kansas later that afternoon (SPC storm reports<\/strong><\/a>).<\/p>\n

The southwestward-propagating outflow boundary \/ undular bore feature was also seen on 4-km resolution GOES-13 6.5 \u00c2\u00b5m water vapor channel imagery (below; click image to play animation)<\/strong><\/em>.<\/p>\n

\"GOES-13<\/a>

GOES-13 6.5 \u00c2\u00b5m water vapor channel images (click image to play animation)<\/p><\/div>\n

The GOES-13 imager 6.5 \u00c2\u00b5m water vapor channel weighting function<\/strong><\/a> calculated using the 12 UTC rawinsonde data<\/strong><\/a> from Dodge City, Kansas (below)<\/strong><\/em> indicated that the weighting function peaked much lower in the atmosphere (around 500 hpa)<\/em> than normal — this allowed a thermal signal (albeit a faint one) of the boundary layer convective outflow boundary cloud features to be seen on the water vapor imagery.<\/p>\n

\"GOES-13<\/a>

GOES-13 water vapor channel weighting function plot (using Dodge City, Kansas rawinsonde data)<\/p><\/div>\n

A good view of the undular bore (which was trailing the leading edge of the convective outflow boundary)<\/em> could be seen on a comparison of 1-km resolution MODIS 0.64 \u00c2\u00b5m visible channel and 11.0 \u00c2\u00b5m IR channel images at 17:05 UTC (below)<\/strong><\/em>.<\/p>\n

\"MODIS<\/a>

MODIS 0.64 \u00c2\u00b5m visible channel and 11.0 \u00c2\u00b5m IR channel images<\/p><\/div>\n

New thunderstorms formed along the old convective outflow boundary (as it encountered increasing instability<\/strong><\/a> across southwestern Kansas during the afternoon hours), as seen on 1-km resolution Suomi NPP VIIRS 0.64 \u00c2\u00b5m visible channel and 11.45 \u00c2\u00b5m IR channel images (below)<\/strong><\/em>. This storm was producing 1-inch diameter hail and wind gusts of 50-60 mph.<\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS 0.64 \u00c2\u00b5m visible channel and 11.45 \u00c2\u00b5m IR channel mages, with SPC reports of hail<\/p><\/div>\n

A comparison of the 1-km resolution Suomi NPP VIIRS 11.45 \u00c2\u00b5m IR channel image with the corresponding 4-km resolution GOES-13 10.7 \u00c2\u00b5m IR channel image (below)<\/strong><\/em> displayed an unusually large 30-degree<\/strong> difference between the coldest cloud-top IR brightness temperatures of the northernmost of the newly-formed thunderstorms in Kansas (-92\u00c2\u00ba C<\/strong> on VIIRS, vs -62\u00c2\u00ba C<\/strong> on GOES).<\/p>\n

\"VIIRS<\/a>

VIIRS 11.45 \u00c2\u00b5m IR channel and GOES-13 10.7 \u00c2\u00b5m IR channel images<\/p><\/div>\n

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

AWIPS images of 1-km resolution GOES-13 0.63 \u00c2\u00b5m visible channel data (above; click image to play animation) showed an undular bore marking a surface-based convective outflow boundary which formed over southwestern Nebraska early in the day on 31 July 2013 — this outflow boundary then propagated southwestward during the day and acted as a focus […]<\/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":[42,15,11,12,3,49,48],"tags":[],"class_list":["post-13569","post","type-post","status-publish","format-standard","hentry","category-convective-initiation","category-goes-sounder","category-goes-13","category-modis","category-severe-convection","category-suomi_npp","category-viirs"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/13569","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=13569"}],"version-history":[{"count":23,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/13569\/revisions"}],"predecessor-version":[{"id":13573,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/13569\/revisions\/13573"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=13569"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=13569"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=13569"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}