{"id":2940,"date":"2009-07-09T20:19:21","date_gmt":"2009-07-09T20:19:21","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=2940"},"modified":"2010-05-20T20:16:11","modified_gmt":"2010-05-20T20:16:11","slug":"severe-convection-in-south-dakota","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/2940","title":{"rendered":"Severe convection in South Dakota"},"content":{"rendered":"
\"GOES-12<\/a>

GOES-12 10.7 \u00c2\u00b5m IR images + hail and wind reports<\/p><\/div>\n

Severe convection developing over eastern South Dakota during the pre-dawn hours on 09 July 2009<\/strong> exhibited an unusually large and well-defined “enhanced-v” storm top signature on AWIPS images of the GOES-12 10.7 \u00c2\u00b5m IR channel (above)<\/em><\/strong> as it produced large hail (up to 2.50 inches in diameter)<\/em> and damaging winds (gusting as high as 90 mph)<\/em> across parts of South Dakota and extreme northeastern Nebraska. <\/p>\n

An overlay of negative and positive cloud-to-ground lighting strikes (below)<\/em><\/strong> showed that this storm was producing a large amount of lightning in the vicinity of the overshooting top (near the vertex of the enhanced-v signature),<\/em> but there was also a number of strikes located a fair distance to the northeast, far away from the coldest cloud tops.<\/p>\n

\"GOES-12<\/a>

GOES-12 10.7 \u00c2\u00b5m IR images + cloud-to-ground lightning strikes<\/p><\/div>\n

A comparison of the 4-km resolution GOES-12 10.7 \u00c2\u00b5m IR data with 1-km resolution NOAA-15 AVHRR 10.8 \u00c2\u00b5m IR data (below)<\/em><\/strong> demonstrated the advantage of improved spatial resolution in detecting the cloud top temperature structure of the enhanced-v signature. The coldest\/warmest cloud top temperatures on the NOAA-15 IR image were -80\u00c2\u00ba C \/ -59\u00c2\u00ba C (deltaT = 21\u00c2\u00ba C)<\/strong>, compared to -68\u00c2\u00ba C \/ -56\u00c2\u00ba C (deltaT = 12\u00c2\u00ba C)<\/strong> on the GOES-12 IR image.<\/p>\n

\"4-km<\/a>

4-km GOES-12 10.7 \u00c2\u00b5m IR + 1-km NOAA-15 10.8 \u00c2\u00b5m IR images<\/p><\/div>\n

A NOAA-15 AVHRR Red\/Green\/Blue (RGB) false-color composite image (below)<\/em><\/strong> displayed a stunning view of the storm just after sunrise (at 11:33 UTC), about 20 minutes after it produced a wind gust to 90 mph, hail up to 1.00 inch in diameter, and brief heavy rain near Scotland in southeastern South Dakota. <\/p>\n

Note that the overshooting top was casting a shadow onto the anvil of the storm below — and this very tall thunderstorm complex was casting an impressive shadow to the west and southwest across South Dakota and Nebraska. Also note the presence of a boundary layer gravity wave train oriented southwest-to-northeast across Nebraska, which was positioned in advance of a cold frontal boundary<\/a><\/strong>.<\/p>\n

\"NOAA-15<\/a>

NOAA-15 AVHRR Red\/Green\/Blue (RGB) false color composite image<\/p><\/div>\n

Additional radar and satellite images of this storm can be found on the AccuWeather WeatherMatrix Blog<\/a><\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Severe convection developing over eastern South Dakota during the pre-dawn hours on 09 July 2009 exhibited an unusually large and well-defined “enhanced-v” storm top signature on AWIPS images of the GOES-12 10.7 \u00c2\u00b5m IR channel (above) as it produced large hail (up to 2.50 inches in diameter) and damaging winds (gusting as high as 90 […]<\/p>\n","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[22,19,30,26,45,3],"tags":[],"class_list":["post-2940","post","type-post","status-publish","format-standard","hentry","category-avhrr","category-goes-12","category-lightning","category-poes","category-redgreenblue-rgb-images","category-severe-convection"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/2940","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=2940"}],"version-history":[{"count":23,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/2940\/revisions"}],"predecessor-version":[{"id":5730,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/2940\/revisions\/5730"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=2940"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=2940"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=2940"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}