{"id":1460,"date":"2008-12-04T15:08:08","date_gmt":"2008-12-04T15:08:08","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=1460"},"modified":"2008-12-04T15:27:49","modified_gmt":"2008-12-04T15:27:49","slug":"mountain-wave-hydraulic-jump-over-colorado","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/1460","title":{"rendered":"Mountain wave hydraulic jump over Colorado"},"content":{"rendered":"
\"GOES-13<\/a>

GOES-13 6.5 \u00c2\u00b5m water vapor images<\/p><\/div>\n

A minor “high wind event” was noted in Boulder, Colorado on 01 December – 02 December 2008<\/strong>, when\u00c2\u00a0 winds gusted as high as 48 mph during the night-time hours. GOES-13 6.5 \u00c2\u00b5m water vapor channel images (above)<\/strong><\/em> showed the formation of mountain waves clouds over the Foothills region of Colorado, as the westerly winds began to increase at Boulder (located in the center of the images)<\/em>. Curiously, Boulder was the only location what experienced the strong winds — and their winds were light southerly until around 18:00 UTC on 01 December (below)<\/strong><\/em>.<\/p>\n

\"Boulder,<\/a>

Boulder, Colorado meteorogram<\/p><\/div>\n

A comparison of GOES-12 and GOES-13 6.5 micrometer water vapor images (below)<\/strong><\/em> showed that a distinct warm\/dry “hydraulic jump” signature formed immediately downwind of the highest terrain. Even though both GOES-12 and GOES-13 have a 4-km resolution water vapor channel, the better viewing angle afforded by the position of GOES-13 at 105\u00c2\u00ba West longitude allowed a clearer depiction of the hydraulic jump (there was an outage of GOES-12 images during the 17:00-21:30 UTC period, due to a GOES-12 North-South station-keeping maneuver)<\/em>.<\/p>\n

\"GOES-12<\/a>

GOES-12 and GOES-13 6.5 \u00c2\u00b5m water vapor images<\/p><\/div>\n

AWIPS images of the 1-km resolution MODIS and the 4-km resolution GOES-12 water vapor images (below)<\/strong><\/em> showed that the hydraulic jump was well-defined at that time, with one pilot report of moderate to severe turbulence at a flight level of 18,000 feet seen over the area of the warm\/dry hydraulic jump signature on water vapor imagery.<\/p>\n

\"MODIS<\/a>

MODIS 6.7 \u00c2\u00b5m and GOES-12 6.5 \u00c2\u00b5m water vapor images<\/p><\/div>\n

Note that the position of the warm\/dry hydraulic jump signature was slightly farther to the west on the MODIS water vapor image — this placed the hydraulic jump closer to the spine of the highest terrain as seen on an AWIPS-2 image of the topography (below)<\/strong><\/em>. The large viewing angle of the GOES satellite does not allow as accurate of a placement of such mesoscale features (compared to the more direct viewing angle of an overpassing polar orbiter satellite)<\/em>.<\/p>\n

\"AWIPS-2<\/a>

AWIPS-2 topography image<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

A minor “high wind event” was noted in Boulder, Colorado on 01 December – 02 December 2008, when\u00c2\u00a0 winds gusted as high as 48 mph during the night-time hours. GOES-13 6.5 \u00c2\u00b5m water vapor channel images (above) showed the formation of mountain waves clouds over the Foothills region of Colorado, as the westerly winds began […]<\/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":[21,18,19,11,12,2,5],"tags":[],"class_list":["post-1460","post","type-post","status-publish","format-standard","hentry","category-aviation","category-goes-11","category-goes-12","category-goes-13","category-modis","category-tropical-cyclones","category-winter-weather"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/1460","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=1460"}],"version-history":[{"count":9,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/1460\/revisions"}],"predecessor-version":[{"id":1464,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/1460\/revisions\/1464"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=1460"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=1460"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=1460"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}