{"id":25859,"date":"2017-10-24T19:09:03","date_gmt":"2017-10-24T19:09:03","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=25859"},"modified":"2017-10-25T14:22:47","modified_gmt":"2017-10-25T14:22:47","slug":"santa-ana-winds-in-southern-california","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/25859","title":{"rendered":"Santa Ana winds in Southern California"},"content":{"rendered":"

\"GOES-16<\/a>

GOES-16 Land Surface Temperature product, with hourly surface reports plotted in white [click to enlarge]<\/p><\/div>* GOES-16 data posted on this page are preliminary, non-operational and are undergoing testing *<\/em><\/p>\n

The GOES-16 Land Surface Temperature product (above,<\/strong> courtesy of Jordan Gerth, CIMSS)<\/strong><\/em> revealed a dramatic increase in the land surface temperature (or surface “skin temperature”) following the onset of easterly\/northeasterly Santa Ana winds in Southern California’s Ventura County during the overnight and early morning hours of 24 October 2017. Between 06-14 UTC (11 PM-7 AM local time),<\/em> the surface air temperature increased from 66-91\u00baF at Oxnard (KOXR<\/strong><\/a>), 75-90\u00baF at Point Mugu (KNTD<\/strong><\/a>) and 77-91\u00baF at Camarillo (KCMA<\/strong><\/a>). Surface wind gusts of 32 mph were recorded at Camarillo during this period, although 64 mph<\/strong><\/a> was reported at South Mountain (elevation 2350 feet)..<\/p>\n

A warming trend in that same area was also evident in the MODIS Land Surface Temperature product (below),<\/strong><\/em> during the time between the Terra (0539 UTC) and Aqua (0951 UTC) overpasses — LST values ranged from the low 60s F (lighter shades of yellow)<\/em> to the upper 80s and low 90s F (darker shades of red)<\/em> in the higher elevations.<\/p>\n

\"Terra<\/a>

Terra and Aqua MODIS Land Surface Temperature product [click to enlarge]<\/p><\/div>A similar warming signature was seen over Ventura County on GOES-16 Shortwave Infrared (3.9 \u00b5m<\/strong><\/a>) images (below)<\/strong><\/em> — although an even more pronounced Santa Ana wind warming signal was evident farther to the southeast over Orange County (where winds gusted as high as 69 mph<\/strong><\/a>); note how the warmer orange-enhanced infrared brightness temperatures surged southwestward toward the coast.<\/p>\n

\"GOES-16<\/a>

GOES-16 Shortwave Infrared (3.9 \u00b5m) images [click to play MP4 animation]<\/p><\/div>A number of record high temperatures resulted from this Santa Ana wind event:<\/p>\n

<\/p>\n
\n

Final record highs for today across SW CA. Some record highs will be possible on Wed as well. #LAHeat<\/a> #LAWeather<\/a> #cawx<\/a> #SoCal<\/a> pic.twitter.com\/gwalGarQmL<\/a><\/p>\n

\u2014 NWS Los Angeles (@NWSLosAngeles) October 25, 2017<\/a><\/p><\/blockquote>\n