{"id":17269,"date":"2019-05-20T16:01:16","date_gmt":"2019-05-20T21:01:16","guid":{"rendered":"https:\/\/inside.nssl.noaa.gov\/ewp\/?p=17269"},"modified":"2019-05-20T16:30:06","modified_gmt":"2019-05-20T21:30:06","slug":"azimuthal-shear-and-lightning-trends-prior-to-tornado","status":"publish","type":"post","link":"https:\/\/inside.nssl.noaa.gov\/ewp\/2019\/05\/20\/azimuthal-shear-and-lightning-trends-prior-to-tornado\/","title":{"rendered":"Azimuthal Shear and Lightning Trends Prior to Tornado"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-17274 aligncenter\" src=\"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-content\/uploads\/sites\/22\/2019\/05\/AZ_radar_052019_2015Z.gif\" alt=\"\" width=\"747\" height=\"339\" \/><\/p>\n<p>Pair of supercells exhibited intensification as they tracked northeast through the eastern Panhandle of Texas. MRMS azimuthal shear ramps up to slightly over 0.010 S-1 near time of a reported tornado from the more eastern of the two supercells. The GLM event density data also increases prior to or near the time of\u00a0 the tornado between 1950z &#8211; 2000z (upper right panel). Comparing to the ENTLN lighting flash frequency (1min data), an jump was noted peaking 1947Z before it dropped off and remained lower through 2000Z (36 count to 15 count). To summarize this data, there was a jump 10-15 min before the tornado, then a drop off, and then another jump 10-15 min after the tornado.<\/p>\n<p><span style=\"text-decoration: underline\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-17281\" src=\"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-content\/uploads\/sites\/22\/2019\/05\/radar_SRV_SW_052019_2019Z.gif\" alt=\"\" width=\"1668\" height=\"820\" \/><\/span>0.5 storm-relative velocity couplet was strongest with the eastern of the two primary mesocyclones. Spectrum width (low right panel) displays a consistently strong signal of wind speed variance with the eastern tornado producing mesocyclone.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-17286\" src=\"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-content\/uploads\/sites\/22\/2019\/05\/Probsevere_052019_2019Z.gif\" alt=\"\" width=\"1872\" height=\"850\" \/>The tornado component of Probsevere jumped significantly before the tornado touchdown. At 1944Z the probability was at 7%, then quickly increased to 46% by 1948Z and peaked at 54% at 1952Z.<\/p>\n<p>-Roy<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pair of supercells exhibited intensification as they tracked northeast through the eastern Panhandle of Texas. MRMS azimuthal shear ramps up to slightly over 0.010 S-1 near time of a reported&#8230; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/inside.nssl.noaa.gov\/ewp\/2019\/05\/20\/azimuthal-shear-and-lightning-trends-prior-to-tornado\/\" class=\"more-link\">Read more \u00bb<\/a><\/p>\n","protected":false},"author":215,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[54,52],"class_list":["post-17269","post","type-post","status-publish","format-standard","hentry","category-news","tag-azshear","tag-glm"],"_links":{"self":[{"href":"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-json\/wp\/v2\/posts\/17269","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-json\/wp\/v2\/users\/215"}],"replies":[{"embeddable":true,"href":"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-json\/wp\/v2\/comments?post=17269"}],"version-history":[{"count":2,"href":"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-json\/wp\/v2\/posts\/17269\/revisions"}],"predecessor-version":[{"id":17296,"href":"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-json\/wp\/v2\/posts\/17269\/revisions\/17296"}],"wp:attachment":[{"href":"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-json\/wp\/v2\/media?parent=17269"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-json\/wp\/v2\/categories?post=17269"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-json\/wp\/v2\/tags?post=17269"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}