{"id":60703,"date":"2024-09-01T13:45:00","date_gmt":"2024-09-01T13:45:00","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=60703"},"modified":"2024-09-02T18:44:13","modified_gmt":"2024-09-02T18:44:13","slug":"evidence-of-a-moisture-discontinuity-in-a-satellite-image","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/60703","title":{"rendered":"Evidence of a moisture discontinuity in a satellite image"},"content":{"rendered":"\n
\"\"<\/a>
Night Microphysics RGB imagery, 0701 UTC on 1 September 2024 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

Nighttime Microphysics RGB Imagery (Quick Guide<\/a>) from the CSPP Geosphere<\/a> site, above (direct link<\/a> to image), from early on 1 September, shows a distinct color change from the southern US to the northern US, stretching east-northeast from Oklahoma to Pennsylvania. This abrupt change from deep purple to light purple heralds a change in moisture — as one might expect in early September as cooler, dryer air starts its inexorable move south as Summer wanes. The cyan color of low clouds is also present along this boundary (and in central Iowa). Part of the color change will be controlled by temperature as well: Blue in the RGB is a function of the Band 13 brightness temperature.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

MIMIC Total Precipitable Water fields, above, from 0700 UTC, also show the sharp gradient in total precipitable water along this boundary as values drop from near 2″ over Arkansas to closer to 1\/2″ over central Missouri. Blended TPW fields, below, taken from the CIRA SLIDER<\/a>, show a similar sharp boundary.<\/p>\n\n\n\n

\"\"<\/a>
Blended Total Precipitable Water Product, 0700 UTC on 1 September 2024 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n

How did Precipitable Water (PWAT) change across this boundary in the 0000 UTC Soundings on 1 September? Skew-Ts, below (from the Wyoming Sounding site<\/a>), from Lincoln IL<\/a> (left, in the dry air), Springfield MO<\/a> (center) and Little Rock AR (right), show PWAT values of 15, 49 and 51 mm, respectively!<\/p>\n\n\n\n

\"\"<\/a>
0000 UTC Soundings from Lincoln IL (Left), Springfield MO (center) and Little Rock AR (right) on 1 September 2024 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n
\n\n\n\n

Hat tip to Jochen Kerkmann, EUMETSAT, for noting this event today and sending out an email.<\/p>\n","protected":false},"excerpt":{"rendered":"

Nighttime Microphysics RGB Imagery (Quick Guide) from the CSPP Geosphere site, above (direct link to image), from early on 1 September, shows a distinct color change from the southern US to the northern US, stretching east-northeast from Oklahoma to Pennsylvania. This abrupt change from deep purple to light purple heralds a change in moisture — […]<\/p>\n","protected":false},"author":19,"featured_media":60704,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[74,79],"tags":[],"class_list":["post-60703","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goes-16","category-microwave"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/60703","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=60703"}],"version-history":[{"count":4,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/60703\/revisions"}],"predecessor-version":[{"id":60713,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/60703\/revisions\/60713"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/60704"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=60703"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=60703"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=60703"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}