LA is experiencing a fall-time heat wave

http://www.chicagotribune.com/la-me-ln-heat-wave-southland-temperatures-20141003-story.html

Residents in the valleys can expect to see temperatures reach 106 in some cities as the heat wave peaks Saturday, the National Weather Service warned. And don't expect much relief in coastal and mountain areas, where temperatures will hover between 90 and 100 degrees.

 The heat is caused by high pressure from the mountains that is pushed down into the valleys and stays there, keeping out ocean breezes that typically flow inland and provide relief.

In Oxnard, the mercury hit 98, beating the record set in 1945 by 2 degrees, according the National Weather Service.

Temperatures hit 100 in Santa Maria, also breaking the 1945 record of 96 degrees. Santa Barbara also set a heat record of 94 degrees, beating the high mark set in 1991 by 3 degrees.