{"id":26710,"date":"2018-01-09T23:59:01","date_gmt":"2018-01-09T23:59:01","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=26710"},"modified":"2018-01-12T23:25:28","modified_gmt":"2018-01-12T23:25:28","slug":"flooding-in-southern-california","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/26710","title":{"rendered":"Flooding in Southern California"},"content":{"rendered":"

\"1-minute<\/a>

1-minute GOES-16 Infrared Window (10.3 \u00b5m)<\/em> images; with hourly reports of surface weather type plotted in red [click to play MP4 animation]<\/p><\/div>An onshore flow of moisture (MIMIC TPW<\/strong><\/a>) in tandem with forcing for ascent with the approach of an upper-level low<\/strong><\/a> and a surface cold\/occluded front brought heavy rainfall and some higher-elevation snowfall (NWS LOX\/SGX<\/strong><\/a> | WPC<\/strong><\/a>) to much of Southern California on 09 January 2018<\/strong><\/a>. To help monitor the event, a GOES-16 (GOES-East)<\/em> Mesoscale Sector<\/strong><\/a> was positioned over the region, providing images at 1-minute intervals. “Clean” Infrared Window (10.3 \u00b5m<\/strong><\/a>) images (above)<\/strong> <\/em>showed the colder clouds associated with periods of moderate to heavy rainfall. Some of this precipitation fell over burn scar areas from wildfires that occurred in December 2017 — including the Thomas fire<\/strong><\/a>, which was the largest on record for the state of California — resulting in numerous mud\/debris slides that caused at least 17 fatalities, destroyed\/damaged hundreds of homes, and closed many streets and highways.<\/p>\n

GOES-16 “Red” Visible (0.64 \u00b5m<\/strong><\/a>) images (below)<\/strong><\/em> showed some of the features which helped produce heavier rainfall and snowfall during the daylight hours on 09 January.<\/p>\n

\"1-minute<\/a>

1-minute GOES-16 “Red” Visible (0.64 \u00b5m)<\/em> images; with hourly reports of surface weather type plotted in red [click to play MP4 animation]<\/p><\/div>The circulation of the upper-level low was easily seen on GOES-16 Mid-level Water Vapor (6.9 \u00b5m<\/strong><\/a>) images (below)<\/strong><\/em>.<\/p>\n

\"1-minute<\/a>

1-minute GOES-16 Water Vapor (6.9 \u00b5m)<\/em> images; with hourly reports of surface weather type plotted in red [click to play MP4 animation]<\/p><\/div>\n

===== 10 January Update =====<\/strong><\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS True-color and False-color RGB images [click to enlarge]<\/p><\/div>On the following day, a toggle between Suomi NPP VIIRS True-color and False-color Red-Green-Blue (RGB) images from RealEarth<\/strong><\/a> (above)<\/strong> <\/em>showed (1)<\/strong> the large burn scar from the Thomas Fire (shades of reddish-brown),<\/em> and (2)<\/strong> snow cover in the higher terrain (darker shades of cyan)<\/em> on the False-color image. The True-color image revealed sediment from runoff flowing into the nearshore waters from Santa Barbara to Oxnard (shades of brown to light green)<\/em>.<\/p>\n

A closer look at the Thomas Fire burn scar was provided by 30-meter resolution Landsat-8 False-color RGB imagery (below),<\/strong><\/em> which showed thin filaments of muddy sediment just offshore, as well as fresh snow cover (shades of cyan)<\/em> along or immediately adjacent to the northeastern edge of the burn scar (in the Hines Peak area). On 10 January, the fire was listed as 92% contained (100% containment was declared on 12 January<\/strong><\/a>).<\/p>\n

\"Landsat-8<\/a>

Landsat-8 False-color RGB image [click to enlarge]<\/p><\/div>\n

===== 11 January Update =====<\/strong><\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS True-color images on 10 January and 11 January [click to enlarge]<\/p><\/div>A comparison of Suomi NPP VIIRS True-color RGB images on 10 January and 11 January (above)<\/strong> <\/em>showed that sediment was flowing farther offshore from the Thomas Fire burn scar area.<\/p>\n

Farther to the south, offshore sediment transport was also seen in the San Diego area (below)<\/strong><\/em>.<\/p>\n

\"Suomi<\/a>

Suomi NPP VIIRS True-color image on 11 January [click to enlarge]<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

An onshore flow of moisture (MIMIC TPW) in tandem with forcing for ascent with the approach of an upper-level low and a surface cold\/occluded front brought heavy rainfall and some higher-elevation snowfall (NWS LOX\/SGX | WPC) to much of Southern California on 09 January 2018. To help monitor the event, a GOES-16 (GOES-East) Mesoscale Sector […]<\/p>\n","protected":false},"author":18,"featured_media":26726,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[74,16,55,53,45,49,48],"tags":[],"class_list":["post-26710","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goes-16","category-heavy-rain-flooding","category-landsat","category-real-earth","category-redgreenblue-rgb-images","category-suomi_npp","category-viirs"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/26710","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=26710"}],"version-history":[{"count":25,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/26710\/revisions"}],"predecessor-version":[{"id":26744,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/26710\/revisions\/26744"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/26726"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=26710"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=26710"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=26710"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}