{"id":49736,"date":"2023-01-06T22:09:00","date_gmt":"2023-01-06T22:09:00","guid":{"rendered":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=49736"},"modified":"2023-01-09T22:35:06","modified_gmt":"2023-01-09T22:35:06","slug":"widespread-fog-stratus-across-the-northern-plains","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/49736","title":{"rendered":"Widespread fog\/stratus over snow cover across the Northern Plains"},"content":{"rendered":"

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GOES-16 “Red” Visible (0.64 \u00b5m), Day Cloud Phase Distinction RGB and Day Snow-Fog RGB images (with and without hourly observations of Ceiling \/ Visibility \/ Surface Weather, plotted in cyan) [click to play MP4 animation | animated GIF<\/strong><\/a>]<\/p><\/div>A sequence of GOES-16 (GOES-East)<\/em> “Red” Visible (0.64 \u00b5m<\/strong><\/a>), Day Cloud Phase Distinction RGB<\/strong><\/a> and Day Snow-Fog RGB<\/strong><\/a> images (above)<\/strong><\/em> showed widespread fog\/stratus across parts of Montana, North\/South Dakota and Minnesota during the day on 06 January 2023<\/strong><\/a>. With a quasi-stationary area of high pressure located over that area (surface analyses<\/strong><\/a>), winds remained light and the fog\/stratus layer was slow to dissipate over much of the region (where snow cover was generally in the 10-20 inch range<\/strong><\/a>). The surface visibility was near zero at some sites, with scattered reports of freezing fog and\/or light snow.<\/p>\n

Plots of rawinsonde data<\/strong><\/a> from Bismarck ND (KBIS) and Aberdeen SD (KABR) are shown below — both sites indicated that a strong and moist boundary layer temperature inversion remained in place during the day, which also helped the fog\/stratus layer to persist or dissipate rather slowly. Judging from the pressure level of sharp dew point decreases, these fog\/stratus features were confined to altitudes of 1200-1400 meters (3900-5000 feet) or lower.<\/p>\n

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Plots of rawinsonde data from Bismarck, North Dakota [click to enlarge]<\/p><\/div>\n

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\u00a0Plots of rawinsonde data from Aberdeen, South Dakota [click to enlarge]<\/p><\/div>\n

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GOES-16 Day Snow-Fog RGB images at 1901 UTC, with an overlay of the corresponding CLAVRx and Operational versions of the Cloud Top Height derived product; cursor-sampled Cloud Top Height values at Bismarck ND are shown [click to enlarge]<\/p><\/div>GOES-16 Day Snow-Fog RGB images at 1901 UTC — with an overlay of the corresponding CLAVR-x<\/strong><\/a> and Operational versions of the Cloud Top Height<\/strong><\/a> (CTH) derived product — include cursor-sampled those two Cloud Top Height values at Bismarck ND (above)<\/strong><\/em> and Aberdeen SD (below)<\/strong><\/em>. It would appear that the 10-km resolution Operational CTH values were unrealistically high — which can often occur over areas with snow cover — compared to the 2-km resolution CLAVR-x CTH values (the full-resolution CLAVR-x products are produced at CIMSS).<\/p>\n

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GOES-16 Day Snow-Fog RGB image at 1901 UTC, with an overlay of the corresponding CLAVRx and Operational versions of the Cloud Top Height derived product; cursor-sampled Cloud Top Height values at Aberdeen SD are shown [click to enlarge]<\/p><\/div>A comparison of GOES-16 Day Snow-Fog RGB image, CLAVRx Cloud Top Height and Operational Cloud Top Height derived products at 1901 UTC is shown below.<\/p>\n

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GOES-16 Day Snow-Fog RGB, CLAVRx Cloud Top Height and Operational Cloud Top Height at 1901 UTC [click to enlarge]<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

A sequence of GOES-16 (GOES-East) “Red” Visible (0.64 \u00b5m), Day Cloud Phase Distinction RGB and Day Snow-Fog RGB images (above) showed widespread fog\/stratus across parts of Montana, North\/South Dakota and Minnesota during the day on 06 January 2023. With a quasi-stationary area of high pressure located over that area (surface analyses), winds remained light and […]<\/p>\n","protected":false},"author":18,"featured_media":49744,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[63,13,74,45,5],"tags":[],"class_list":["post-49736","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-clavrx","category-fog-detection","category-goes-16","category-redgreenblue-rgb-images","category-winter-weather"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/49736","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=49736"}],"version-history":[{"count":16,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/49736\/revisions"}],"predecessor-version":[{"id":56144,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/49736\/revisions\/56144"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/49744"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=49736"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=49736"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=49736"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}