Those winds could shift into Santa Ana winds from the northeast over Los Angeles and Ventura counties Thursday and Friday. A red flag recordThe Thomas fire has been fueled by the longest sustained period of fire weather warnings on record for this region. After red flag warnings ended briefly Friday, they resumed again over the weekend. LA Times Santa Ana winds Santa Ana winds (LA Times)National Weather Service Sundowner winds Sundowner winds (National Weather Service)Blame high pressureThere’s been a gigantic mass of high pressure in the Pacific Ocean so large it spread to over Nevada and the Great Basin area. The 12 days of red flag warnings were a record for the National Weather Service office in Oxnard, Seto said.

Source: Los Angeles Times December 19, 2017 15:22 UTC