{"id":43265,"date":"2021-11-12T18:35:42","date_gmt":"2021-11-12T18:35:42","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=43265"},"modified":"2021-11-15T21:30:11","modified_gmt":"2021-11-15T21:30:11","slug":"antecedent-lake-effect-snow-conditions-over-the-great-lakes","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/43265","title":{"rendered":"Antecedent lake-effect snow conditions over the Great Lakes"},"content":{"rendered":"\n
\"\"<\/a>
ACSPO SSTs from NOAA-20 VIIRS Imagery, 0739 UTC on 10 November 2021 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

Clear skies in the early morning of 10 November 2021 allowed mapping of lake surface temperatures (LSTs) over the Great Lakes using the Advanced Clear-Sky Processor for Oceans (ACSPO<\/a>) algorithm with VIIRS data acquired at the direct broadcast site at CIMSS. Surface values over Lake Superior, for example, were in the mid-40s (\u00ba Fahrenheit; the color bar ranges from 41\u00ba F to 59\u00ba F — 5\u00ba to 15\u00ba C); much of central Lake Erie is in the upper-50s! What do temperatures in the airmass poised to move over the Lakes look like?<\/p>\n\n\n\n

QuickLook software (from this site<\/a>, with use described in this blog post<\/a>) can be used with Direct Broadcast output of NUCAPS EDR data (in this directory<\/a>, for example) to produce 852-mb temperature fields, as shown below. (You can routinely view fields of dewpoint, relative humidity and mixing ratio at 247, 496, 753 and 904 mb here<\/a>, for example, as well). Minimum 850-mb temperatures as diagnosed by NUCAPS are around -10\u00ba to -13\u00ba C. A common-cited minimum temperature difference threshold between lake and 850 mb is 13\u00ba (Celsius) (as noted here<\/a> and in many other places); certainly that is satisfied based on the ACSPO SSTs and the NUCAPS temperatures!<\/p>\n\n\n\n

\"\"<\/a>
852-mb temperature from NUCAPS EDRs, 0847 UTC on 12 November 2021 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

A similar image, below (produced about 90 minutes after the NOAA-20 overpass) also shows the cold air ready to overspread the Great Lakes.<\/p>\n\n\n\n

\"\"<\/a>
852-mb temperature from NUCAPS EDRs, 1827 UTC on 12 November 2021 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

Gridded NUCAPS fields at 850 mb are also available at this site<\/a> maintained by NASA SPoRT. The toggle below shows temperature at 850 mb and Quality Control Flags (yellow corresponds to regions where the infrared retrieval did not converge to a solution — but the microwave retrieval did) from the same afternoon overpass from NOAA-20 as shown above.<\/p>\n\n\n\n

\"\"<\/a>
850-mb Temperatures and NUCAPS Quality Control, 1824 UTC on 12 November 2021 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n
\n\n\n\n

AWIPS-ready ACSPO SST fields are available to National Weather Service offices via LDM. Contact the blog author for details.<\/p>\n","protected":false},"excerpt":{"rendered":"

Clear skies in the early morning of 10 November 2021 allowed mapping of lake surface temperatures (LSTs) over the Great Lakes using the Advanced Clear-Sky Processor for Oceans (ACSPO) algorithm with VIIRS data acquired at the direct broadcast site at CIMSS. Surface values over Lake Superior, for example, were in the mid-40s (\u00ba Fahrenheit; the […]<\/p>\n","protected":false},"author":19,"featured_media":43267,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[78,83],"tags":[],"class_list":["post-43265","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-noaa-20","category-nucaps"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/43265","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\/19"}],"replies":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/comments?post=43265"}],"version-history":[{"count":8,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/43265\/revisions"}],"predecessor-version":[{"id":43295,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/43265\/revisions\/43295"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/43267"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=43265"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=43265"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=43265"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}