{"id":18929,"date":"2021-06-10T16:48:15","date_gmt":"2021-06-10T21:48:15","guid":{"rendered":"https:\/\/inside.nssl.noaa.gov\/ewp\/?p=18929"},"modified":"2021-06-10T16:48:15","modified_gmt":"2021-06-10T21:48:15","slug":"comparing-glm-products-from-goes-16-and-17-wednesday","status":"publish","type":"post","link":"https:\/\/inside.nssl.noaa.gov\/ewp\/2021\/06\/10\/comparing-glm-products-from-goes-16-and-17-wednesday\/","title":{"rendered":"Comparing GLM Products from GOES 16 and 17- Wednesday"},"content":{"rendered":"

An approaching short wave trough as well as a remnant MCV moving through the area helped trigger thunderstorms over the upper Midwest. \u00a0Convection developed over Minnesota during the afternoon and evening hours. \u00a0Storms did not become severe near the Grand Forks, ND CWA until late in the afternoon.\u00a0<\/span><\/p>\n

The upper Midwest is near the extent of coverage for both GOES 17 West and GOES 16 East. \u00a0This made it a good chance to compare how the GLM lightning products were affected by this issue. \u00a0Research has shown flash densities for both satellites diminish in this area, well away from the nadir of both satellites.\u00a0<\/span><\/p>\n

\"\"
Image 1 shows Flash Extent Density for GOES 17 on the left, and GOES 16 on the right.<\/figcaption><\/figure>\n

The character and quality of the Flash Extent Density (FED) returns from each of the satellites can be seen, with GOES 17 showing a slightly westward tilt, and an eastward tilt in the returned grids for GOES 16. \u00a0The strongest storm in north central Minnesota has a higher and possibly better return on 17 than on 16.<\/p>\n

\"\"
Image 2 shows Minimum Flash Area for GOES 17 on the left, and GOES 16 on the right.<\/figcaption><\/figure>\n

Values of Minimum Flash Areas from the satellites were quite different in some cases, and were also skewed as a result of the distance from the nadir of each satellite. \u00a0Placement of the flash areas also differed from \u201cviewing\u201d angle.<\/p>\n

\"\"
Image 3 shows Total Optical Energy from GOES 17 on the left, and GOES 16 on the right at 1958Z.<\/figcaption><\/figure>\n

Total Optical Imagery (TOE) was also skewed. \u00a0It is interesting to note that the pixels of TOE in far southeastern ND change from minute to minute, as seen in Images 3 and 4. \u00a0At 1958Z, GOES 17 had an area of TOE returns along the ND\/SD\/MN borders, while GOES 16 had 2 separate areas, one in southern ND and one in west central MN. \u00a0By 1959Z, both GOES 17 and 16 agreed that there were 2 separate TOE returns in this region.<\/p>\n

\"\"
Image 4 shows Total Optical Energy from GOES 17 on the left, and GOES 16 on the right at 1959Z.<\/figcaption><\/figure>\n

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

An approaching short wave trough as well as a remnant MCV moving through the area helped trigger thunderstorms over the upper Midwest. \u00a0Convection developed over Minnesota during the afternoon and… <\/p>\n

Read more \u00bb<\/a><\/p>\n","protected":false},"author":181,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[64],"tags":[],"class_list":["post-18929","post","type-post","status-publish","format-standard","hentry","category-glm"],"_links":{"self":[{"href":"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-json\/wp\/v2\/posts\/18929","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\/181"}],"replies":[{"embeddable":true,"href":"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-json\/wp\/v2\/comments?post=18929"}],"version-history":[{"count":1,"href":"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-json\/wp\/v2\/posts\/18929\/revisions"}],"predecessor-version":[{"id":18930,"href":"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-json\/wp\/v2\/posts\/18929\/revisions\/18930"}],"wp:attachment":[{"href":"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-json\/wp\/v2\/media?parent=18929"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-json\/wp\/v2\/categories?post=18929"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/inside.nssl.noaa.gov\/ewp\/wp-json\/wp\/v2\/tags?post=18929"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}