{"id":15828,"date":"2014-06-02T23:59:28","date_gmt":"2014-06-02T23:59:28","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=15828"},"modified":"2014-06-05T14:34:58","modified_gmt":"2014-06-05T14:34:58","slug":"offshore-mesovortex-affecting-inland-penetration-of-marine-fogstratus-along-the-california-coast","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/15828","title":{"rendered":"Offshore mesovortex affecting the inland penetration of marine stratus along the California coast"},"content":{"rendered":"
\"GOES-15<\/a>

GOES-15 0.63 \u00b5m visible channel images (click to play animation)<\/p><\/div>\n

On 02 June 2014<\/strong><\/a>, McIDAS images of 1-km resolution GOES-15 0.63 \u00b5m visible channel data (above; click image to play animation)<\/strong><\/em> revealed the presence of a cyclonic mesoscale vortex in the vicinity of Point Reyes along the California coast, which appeared to be playing a role in enhancing the inland penetration of marine fog\/stratus into areas such as the San Francisco Bay region just south of the mesovortex.<\/p>\n

An AWIPS image of 375-meter resolution (projected onto a 1-km AWIPS grid)<\/em> Suomi NPP<\/strong><\/a> VIIRS<\/strong><\/a> 0.64 \u00b5m visible channel data at 21:07 UTC (below)<\/strong><\/em> included overlays of surface station and buoy reports, along with MADIS<\/strong><\/a> 1-hour satellite-derived atmospheric motion vectors within the 1050-900 mb layer at 21 UTC. The satellite cloud-tracked winds appeared to be picking up on the cyclonic circulation of the mesovortex. At this particular time, winds at San Francisco (station identifier KSFO)<\/em> were southwesterly gusting to 23 knots.<\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS 0.64 \u00b5m visible channel image, with surface and buoy observations and 1-hour MADIS satellite winds<\/p><\/div>\n

A time series of surface observation at San Francisco International Airport (below)<\/strong><\/em> showed the increase in layered stratus clouds (with ceilings of 1000 to 1500 feet)<\/em> after the southwesterly winds began to increase around 19 UTC.<\/p>\n

\"Time<\/a>

Time series of surface observations at San Francisco International Airport<\/p><\/div>\n

AWIPS images of the GOES-R Cloud Thickness product — with the GOES-R<\/strong> algorithm for Fog and Low Stratus products<\/strong><\/a>\u00a0applied to GOES-15 data — indicated that the thickness of the stratus clouds moving inland across the San Francisco Bay area was only about 500 feet (below; click image to play animation)<\/strong><\/em>. The thicker stratus clouds with depths of 1000-3000 feet remained off the coast of California.<\/p>\n

\"GOES-15<\/a>

GOES-15 Cloud Thickness product (click to play animation)<\/p><\/div>\n

The corresponding GOES-15 Marginal Visual Flight Rules (MVFR) product (below; click image to play animation)<\/strong><\/em> showed that MVFR probability values were generally below 50-60% in the San Francisco Bay area, with much higher probabilities existing within the offshore marine boundary layer stratus cloud field.<\/p>\n

\"GOES-15<\/a>

GOES-15 Marginal Visual Flight Rules (MVFR) Probability product (click to play animation)<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

On 02 June 2014, McIDAS images of 1-km resolution GOES-15 0.63 \u00b5m visible channel data (above; click image to play animation) revealed the presence of a cyclonic mesoscale vortex in the vicinity of Point Reyes along the California coast, which appeared to be playing a role in enhancing the inland penetration of marine fog\/stratus into […]<\/p>\n","protected":false},"author":18,"featured_media":15839,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[43,34,25,49,48],"tags":[],"class_list":["post-15828","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goes-15","category-goes-r","category-satellite-winds","category-suomi_npp","category-viirs"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/15828","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=15828"}],"version-history":[{"count":10,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/15828\/revisions"}],"predecessor-version":[{"id":15838,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/15828\/revisions\/15838"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/15839"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=15828"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=15828"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=15828"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}