Sierra Peak antenna farm blasting the LA basin.
Effect is most visible around sunrise.
https://radar.weather.gov/?settings=v1_eyJhZ2VuZGEiOnsiaWQiOiJ3ZWF0aGVyIiwiY2VudGVyIjpbLTExNy43NzMsMzMuODNdLCJ6b29tIjo4LCJsb2NhdGlvbiI6Wy05MC4zNTIsMzguNDIyXX0sImFuaW1hdGluZyI6dHJ1ZSwiYmFzZSI6InN0YW5kYXJkIiwiY291bnR5IjpmYWxzZSwiY3dhIjpmYWxzZSwic3RhdGUiOmZhbHNlLCJtZW51Ijp0cnVlLCJzaG9ydEZ1c2VkT25seSI6ZmFsc2UsIm9wYWNpdHkiOnsiYWxlcnRzIjowLjIyLCJsb2NhbCI6MC42LCJsb2NhbFN0YXRpb25zIjowLjgsIm5hdGlvbmFsIjowLjZ9fQ%3D%3D#/