{"id":7213,"date":"2010-11-18T23:59:49","date_gmt":"2010-11-18T23:59:49","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=7213"},"modified":"2011-01-25T18:05:55","modified_gmt":"2011-01-25T18:05:55","slug":"cold-air-outbreak-and-ice-formation-across-hudson-bay-canada","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/7213","title":{"rendered":"Cold air outbreak (and ice formation) across Hudson Bay, Canada"},"content":{"rendered":"
\"GOES-13<\/a>

GOES-13 0.63 \u00c2\u00b5m visible channel images<\/p><\/div>\n

A strong cyclone was located over the northern portion of Hudson Bay, Canada on 18 November 2010<\/strong><\/a> — and McIDAS images of GOES-13 0.63 \u00c2\u00b5m visible channel data (above)<\/strong><\/em> showed the formation of widespread cloud bands due to very cold arctic air flowing over the still-unfrozen waters of Hudson Bay.<\/p>\n

The strong westerly component of the surface winds was apparently helping to cause some of the land-fast ice along the far western shoreline to begin to drift eastward into the open waters of Hudson Bay. This was more easily seen on a zoomed-in version<\/a><\/strong> of the GOES-13 visible images. According to lower-tropospheric GOES-13 atmospheric motion vectors<\/a><\/strong>, the speed of motion of the cloud band features was generally in the 25-35 knot range.<\/p>\n

A closer view using AWIPS images of 1-km resolution MODIS<\/a><\/strong> 0.65 \u00c2\u00b5m visible channel data (below)<\/em><\/strong> revealed better detail in the cloud band structure — but also suggested the initiation of ice formation along the western and southwestern near-shore waters of Hudson Bay.<\/p>\n

\"MODIS<\/a>

MODIS 0.65 \u00c2\u00b5m visible channel images<\/p><\/div>\n

To verify that the brighter near-shore features seen on the MODIS visible images were indeed ice forming in Hudson Bay, a pair of false-color Red\/Green\/Blue (RGB) images were created using the MODIS 0.65 \u00c2\u00b5m visible channel data as the Red component and the MODIS 2.1 \u00c2\u00b5m “snow\/ice channel” data as the Green and Blue components of the image. Snow cover (which was generally 3-5 inches at the first-order reporting stations in the region)<\/em> and thick ice show up as darker red features on the RGB images.<\/p>\n

\"MODIS<\/a>

MODIS false-color Red\/Green\/Blue (RGB) images<\/p><\/div>\n

An AWIPS image of the POES AVHRR<\/a><\/strong> Cloud Type product (below)<\/em><\/strong> indicated that many of the cloud bands likely consisted of supercooled water droplets (green color enhancement),<\/em> although a number of the cloud bands were beginning to show signs of glaciating farther downstream (as indicated by the yellow and orange color enhancements)<\/em>.<\/p>\n

\"POES<\/a>

POES AVHRR Cloud Type product<\/p><\/div>\n

The POES AVHRR Cloud Top Height product (below)<\/em><\/strong> showed that the tops of most of thee cloud bands were in the 3-4 km range.<\/p>\n

\"POES<\/a>

POES AVHRR Cloud Top Height product<\/p><\/div>\n

Another indication of the change from supercooled water droplets to more of a glaciated composition could be seen on the POES AVHRR Cloud Particle Effective Radius product (below),<\/em><\/strong> with an increasing presence of the larger size ice crystals showing up as increasingly darker blue colors farther downstream.<\/p>\n

\"POES<\/a>

POES AVHRR Cloud Particle Effective Radius product<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

A strong cyclone was located over the northern portion of Hudson Bay, Canada on 18 November 2010 — and McIDAS images of GOES-13 0.63 \u00c2\u00b5m visible channel data (above) showed the formation of widespread cloud bands due to very cold arctic air flowing over the still-unfrozen waters of Hudson Bay. The strong westerly component of […]<\/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":[22,11,12,26,45,25,5],"tags":[],"class_list":["post-7213","post","type-post","status-publish","format-standard","hentry","category-avhrr","category-goes-13","category-modis","category-poes","category-redgreenblue-rgb-images","category-satellite-winds","category-winter-weather"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/7213","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=7213"}],"version-history":[{"count":8,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/7213\/revisions"}],"predecessor-version":[{"id":7524,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/7213\/revisions\/7524"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=7213"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=7213"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=7213"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}