{"id":4511,"date":"2010-02-09T23:59:03","date_gmt":"2010-02-09T23:59:03","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=4511"},"modified":"2010-02-12T22:12:28","modified_gmt":"2010-02-12T22:12:28","slug":"strong-potential-vorticity-anomaly-off-the-california-coast","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/4511","title":{"rendered":"Strong potential vorticity anomaly off the California coast"},"content":{"rendered":"
\"GOES<\/a>

GOES waver vapor imagery + PV1.5 pressure + 500 hPa geopotential height<\/p><\/div>\n

A strong potential vorticity (PV) anomaly was propagating southeastward just off the California coast on 09 February 2010<\/a><\/strong> — and this feature had a striking presentation on AWIPS images of GOES-11 water vapor channel data (above)<\/em><\/strong>, with a pronounced arc of very dry air (yellow color enhancement)<\/em> seen around the periphery of the circulation. According to the CRAS model<\/a><\/strong> fields, the tropopause (taken to be the pressure of the PV1.5 surface)<\/em> was being brought downward as low as the 600 hPa pressure level within the core of the PV anomaly.<\/p>\n

Images of the GOES-11 sounder Total Column Ozone derived product (below)<\/em><\/strong> depicted ozone values as high as 430 Dobson Units (red color enhancement)<\/em> in the vicinity of the PV anomaly, supporting the idea that the tropopause height was very depressed within the circulation feature.<\/p>\n

\"GOES<\/a>

GOES sounder Total Column Ozone + PV1.5 pressure + 500 hPa geoptential height<\/p><\/div>\n

=================================<\/p>\n

\"GOES-11<\/a>

GOES-11 Sounder and Imager water vapor channel images<\/p><\/div>\n

A 4-panel comparison of the three water vapor channels on the GOES-11 Sounder (6.5 \u00c2\u00b5m, 7.0 \u00c2\u00b5m, and 7.4 \u00c2\u00b5m)<\/em> and the GOES-11 Imager 6.7 \u00c2\u00b5m water vapor channel (above)<\/em><\/strong> showed that the dry air signature was even quite evident on the Sounder 6.5 \u00c2\u00b5m channel (darker blue color enhancement, upper left panels)<\/em> — this particular water vapor channel weighting function normally peaks quite high in the atmosphere (around 325 hPa),<\/em> where these types of water vapor gradients and signatures are usually not as well-defined. <\/p>\n

However, due to the dry air within the middle to upper troposphere associated with the PV anomaly, the weighting functions<\/a><\/strong> of all 4 of the GOES-11 water vapor channels (calculated using rawinsonde data from Vandenberg Air Force Base)<\/em> peaked at altitudes that were quite a bit lower compared to the more “normal” conditions that would be seen in a US Standard Atmosphere or USSA environment (below)<\/em><\/strong>. Convection moving onshore across southern California that day was responsible for at least one sighting of a waterspout in the San Diego area, and inland precipitation amounts of 1.0 to 1.5 inch were widespread.<\/p>\n

\"GOES-11<\/a>

GOES-11 sounder and imager water vapor weighting functions (Vandenberg vs USSA)<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

A strong potential vorticity (PV) anomaly was propagating southeastward just off the California coast on 09 February 2010 — and this feature had a striking presentation on AWIPS images of GOES-11 water vapor channel data (above), with a pronounced arc of very dry air (yellow color enhancement) seen around the periphery of the circulation. According […]<\/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":[15,18],"tags":[],"class_list":["post-4511","post","type-post","status-publish","format-standard","hentry","category-goes-sounder","category-goes-11"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/4511","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=4511"}],"version-history":[{"count":8,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/4511\/revisions"}],"predecessor-version":[{"id":4535,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/4511\/revisions\/4535"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=4511"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=4511"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=4511"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}