{"id":13410,"date":"2013-07-08T23:59:43","date_gmt":"2013-07-08T23:59:43","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=13410"},"modified":"2017-07-19T14:56:26","modified_gmt":"2017-07-19T14:56:26","slug":"severe-thunderstorms-over-northeastern-montana","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/13410","title":{"rendered":"Severe thunderstorms over northeastern Montana"},"content":{"rendered":"
\"GOES-15<\/a>

GOES-15 (left) and GOES-13 (right) 0.63 \u00b5m visible channel images (click image to play animation)<\/p><\/div>\n

Severe thunderstorms developed during the afternoon hours across parts of northeastern Montana on 08 July 2013<\/strong><\/a>. A comparison of McIDAS images of 1-km resolution GOES-15 (GOES-West)<\/em> and GOES-13 (GOES-East)<\/em> 0.63 \u00b5m visible channel data (above; click image to play animation)<\/strong><\/em> showed the early stages of development of the storm that went on to produce large hail (up to 3 inches in diameter)<\/em> and straight-line winds from a macroburst gusting as high as an estimated 95 mph (SPC storm reports<\/strong><\/a> | NWS Glasgow public information statement<\/strong><\/a>). Some locations also received heavy rain (as much as 1.87 inches in a 1 hour period)<\/em> that produced flash flooding. One interesting feature seen on the visible imagery was a region of inflow feeder bands<\/strong><\/a> along the southern flank of the developing thunderstorm as it was northwest of Jordan (station identifier KJDN)<\/em>.<\/p>\n

AWIPS images of 4-km resolution GOES-13 10.7 \u00b5m IR channel data with overlays of SPC storm reports (below; click image to play animation)<\/strong><\/em> revealed the formation of an “enhanced-V” storm top signature with the storm as it was north of Jordan, which is usually an indicator that a storm is or is about to produce severe weather in the form of large hail, tornadoes, or damaging winds.<\/p>\n

\"GOES-13<\/a>

GOES-13 10.7 \u00b5m IR channel images with hail and severe wind gust reports (click image to play animation)<\/p><\/div>\n

A closer view using 375-meter resolution (projected onto a 1-km AWIPS grid)<\/em> Suomi NPP VIIRS 0.64 \u00b5m visible channel and 11.45 \u00b5m IR channel data at 20:30 UTC (below)<\/strong><\/em> showed a textbook example of a well-defined enhanced-V signature on the IR image. The coldest cloud-top IR brightness temperature in the overshooting top region was -69\u00ba C<\/strong> (black color enhancement)<\/em>, while the IR brightness temperature in the nearby upstream “warm wake” region was -44\u00ba C<\/strong> (darker green color enhancement),<\/em> making for an impressively large 25\u00ba C “delta-T” value. About 1 hour later this storm began to produce 1.75 inch diameter hail in Garfield county (north of Jordan).<\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS 0.64 \u00b5m visible channel and 11.45 \u00b5m IR channel images<\/p><\/div>\n

A comparison of the VIIRS IR image with the corresponding GOES-13 IR image (below)<\/strong><\/em> demonstrated the advantages of using polar-orbiter satellite date for severe storm identification: (1) with higher spatial resolution, severe storm signatures such as the “enhanced-V” are much better defined, and (2) there is minimal “parallax shift<\/strong><\/a>” associated with the large viewing angle from geostationary satellites positioned over the Equator.<\/p>\n

\"Suomi<\/a>

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

===== 10 July Update =====<\/strong><\/p>\n

A comparison of before (04 July)<\/em> and after (10 July)<\/em> 250-meter resolution MODIS true-color Red\/Green\/Blue (RGB) images from the SSEC MODIS Today<\/strong><\/a> site (below; displayed using Google Earth)<\/strong><\/em> revealed the extensive hail damage swath that was located from the north and northeast to the east and southeast\u00a0 of Jordan, Montana (yellow arrows)<\/em>. At its widest point in far southern McCone county, the hail swath appeared to be at least 10-12 km (6-7 miles)<\/em> wide.<\/p>\n

\"Before<\/a>

Before (04 July) and after (10 July) MODIS true-color RGB images showing the hail damage swath<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

Severe thunderstorms developed during the afternoon hours across parts of northeastern Montana on 08 July 2013. A comparison of McIDAS images of 1-km resolution GOES-15 (GOES-West) and GOES-13 (GOES-East) 0.63 \u00b5m visible channel data (above; click image to play animation) showed the early stages of development of the storm that went on to produce large […]<\/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":[11,32,12,45,49,48],"tags":[],"class_list":["post-13410","post","type-post","status-publish","format-standard","hentry","category-goes-13","category-google-earth","category-modis","category-redgreenblue-rgb-images","category-suomi_npp","category-viirs"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/13410","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=13410"}],"version-history":[{"count":10,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/13410\/revisions"}],"predecessor-version":[{"id":24524,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/13410\/revisions\/24524"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=13410"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=13410"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=13410"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}