{"id":23023,"date":"2017-01-31T23:59:07","date_gmt":"2017-01-31T23:59:07","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=23023"},"modified":"2017-02-03T22:50:28","modified_gmt":"2017-02-03T22:50:28","slug":"tule-fog-in-california","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/23023","title":{"rendered":"Tule fog in California"},"content":{"rendered":"<p><center><\/p>\n<blockquote class=\"twitter-tweet\" data-lang=\"en\">\n<p dir=\"ltr\" lang=\"en\">The red is where the fog is the thickest, with near zero visibility. Very dangerous driving conditions, only drive if necessary <a href=\"https:\/\/twitter.com\/hashtag\/TuleFog?src=hash\">#TuleFog<\/a> <a href=\"https:\/\/t.co\/yl9wORdJO6\">pic.twitter.com\/yl9wORdJO6<\/a><\/p>\n<p>\u2014 NWS Hanford (@NWSHanford) <a href=\"https:\/\/twitter.com\/NWSHanford\/status\/826445666012504064\">January 31, 2017<\/a><\/p><\/blockquote>\n<p><script async src=\"\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script><br \/>\n<\/center><\/p>\n<p>The tweet shown above was issued by the NWS forecast office in <a href=\"http:\/\/www.wrh.noaa.gov\/hnx\/\"><strong>Hanford, California<\/strong><\/a> &#8212; using an image of the GOES-15 Low Instrument Flight Rules (LIFR) Probability, a component of the <a href=\"http:\/\/rammb.cira.colostate.edu\/training\/visit\/training_sessions\/forecaster_training_for_the_goes-r_fog_low_stratus_products\/\"><strong>GOES-R Fog\/low stratus<\/strong><\/a> suite of products &#8212; to illustrate where areas of dense <a href=\"https:\/\/en.wikipedia.org\/wiki\/Tule_fog\"><strong>Tule fog<\/strong><\/a> persisted into the morning hours on <a href=\"http:\/\/www.wpc.ncep.noaa.gov\/dailywxmap\/index_20170131.html\"><strong>31 January 2017<\/strong><\/a>.<\/p>\n<p>AWIPS II images of the GOES-15 Marginal Visual Flight Rules (MVFR) product<em><strong> (below)<\/strong><\/em> showed the increase in areal coverage of Tule fog beginning at 0600 UTC <em>(10 pm local time on 30<\/em> <em>January);<\/em> the fog eventually dissipated by 2030 UTC<em> (12:30 pm local time)<\/em> on 31 January. Note that Lemoore Naval Air Station (identifier KNLC) reported freezing fog at 14 UTC (their surface air temperature had dropped to 31\u00ba F that hour). In addition, some of the higher MVFR Probability values were seen farther to the north, along the Interstate 5 corridor between Stockton (KSCK) and Sacramento (KSAC) &#8212; numerous traffic accidents and school delays were attributed to the Tule fog on this day.<\/p>\n<div style=\"width: 650px\" class=\"wp-caption aligncenter\"><a class=\"thumbnail\" href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2017\/01\/170131_goes15_mvfr_probability_CA_Tule_fog_anim.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"thumbnail\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2017\/01\/170131_1500utc_goes15_mvfr_probability.png\" alt=\"GOES-15 MVFR Probability product [click to play animation]\" width=\"640\" height=\"386\" \/><\/a><p class=\"wp-caption-text\">GOES-15 MVFR Probability product [click to play animation]<\/p><\/div>\n<p style=\"text-align: center;\">&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;<\/p>\n<p>&nbsp;<\/p>\n<p><div style=\"width: 650px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2017\/01\/170131_0900utc_goes15_mvfr_aqua_modis_btd_anim.gif\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2017\/01\/170131_0900utc_goes15_mvfr_aqua_modis_btd_anim.gif\" alt=\"GOES-15 MVFR Probability and Aqua MODIS Infrared Brightness Temperature Difference (BTD) products [click to enlarge]\" width=\"640\" height=\"389\" \/><\/a><p class=\"wp-caption-text\">GOES-15 MVFR Probability and Aqua MODIS Infrared Brightness Temperature Difference (BTD) products [click to enlarge]<\/p><\/div>Legacy infrared Brightness Temperature Difference (BTD) products are limited in their ability to accurately detect fog\/low stratus features if high-level cirrus clouds are present overhead. This is demonstrated in comparisons of GOES-15 MVFR Probability and BTD products from Aqua MODIS <em><strong>(above)<\/strong><\/em> and Suomi NPP VIIRS <em><strong>(below)<\/strong><\/em>. Again, note the Interstate-5 corridor between Stockton and Sacramento, where the extent of the fog was not well-depicted on the BTD images (even using high spatial resolution polar-orbiter MODIS and VIIRS data).<\/p>\n<p><div style=\"width: 650px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2017\/01\/170131_1015utc_goes15_mvfr_suomi_npp_viirs_btd_anim.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2017\/01\/170131_1015utc_goes15_mvfr_suomi_npp_viirs_btd_anim.gif\" alt=\"GOES-15 MVFR Probability and Suomi NPP VIIRS infrared Brightness Temperature Difference (BTD) products [click to enlarge]\" width=\"640\" height=\"386\" \/><\/a><p class=\"wp-caption-text\">GOES-15 MVFR Probability and Suomi NPP VIIRS infrared Brightness Temperature Difference (BTD) products [click to enlarge]<\/p><\/div>Daylight images of GOES-15 Visible (0.63 \u00b5m) data <em><strong>(below)<\/strong><\/em> showed the dissipation of the Tule fog during the 1600-2200 UTC<em> (8 am &#8211; 2 pm local time)<\/em> period. The brighter white snow pack in the higher elevations of the Sierra Nevada was also very evident in the upper right portion of the satellite scene.<\/p>\n<p><div style=\"width: 650px\" class=\"wp-caption aligncenter\"><a class=\"thumbnail\" href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2017\/01\/170131_goes15_visible_Tule_fog_CA_anim.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"thumbnail\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2017\/01\/960x1280_AGOES15_B1_GOES15_VIS_TULE_FOG_31JAN2017_2017031_183000_0001PANEL.GIF\" alt=\"GOES-15 Visible (0.63 \u00b5m) images [click to play animation]\" width=\"640\" height=\"480\" \/><\/a><p class=\"wp-caption-text\">GOES-15 Visible (0.63 \u00b5m) images [click to play animation]<\/p><\/div>One ingredient contributing to this Tule fog event was moist soil, from <a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2017\/01\/170131_14day_precip.jpeg\"><strong>precipitation<\/strong><\/a> (as much as <a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2017\/01\/170131_14day_percent_of_normal.jpeg\"><strong>150-200% of normal<\/strong><\/a> at some locations in the Central Valley) that had been received during the previous 14-day period <em><strong>(below)<\/strong><\/em>.<\/p>\n<div style=\"width: 654px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2017\/01\/170131_14day_Precip_Percent-of-normal_CA_anim.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2017\/01\/170131_14day_Precip_Percent-of-normal_CA_anim.gif\" alt=\"Total liquid precipitation and Percent of normal precipitation for the 14-day period ending on 31 January 2017 [click to enlarge]\" width=\"644\" height=\"739\" \/><\/a><p class=\"wp-caption-text\">Total liquid precipitation and Percent of normal precipitation for the 14-day period ending on 31 January 2017 [click to enlarge]<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>The red is where the fog is the thickest, with near zero visibility. Very dangerous driving conditions, only drive if necessary #TuleFog pic.twitter.com\/yl9wORdJO6 \u2014 NWS Hanford (@NWSHanford) January 31, 2017 The tweet shown above was issued by the NWS forecast office in Hanford, California &#8212; using an image of the GOES-15 Low Instrument Flight Rules [&hellip;]<\/p>\n","protected":false},"author":18,"featured_media":23031,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[70,13,43,34,12,49,48],"tags":[],"class_list":["post-23023","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aqua","category-fog-detection","category-goes-15","category-goes-r","category-modis","category-suomi_npp","category-viirs"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/23023","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=23023"}],"version-history":[{"count":17,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/23023\/revisions"}],"predecessor-version":[{"id":23050,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/23023\/revisions\/23050"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/23031"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=23023"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=23023"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=23023"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}