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Pilawt
Normal prevailing winds in the L.A. Basin are from the west or south.How do you know if the Santa Ana winds are forecasted? They actually says Santa Ana winds?
If there’s a terminal forecast for KONT for surface winds out of the north or east of 15 knots or better, there’s a clue that Banning and Cajon will be affected by Santa Anas. If winds like that are also forecast at KLGB, then it’s likely to be a howler through all the passes. Santa Anas usually last 2 to 5 days.
It might not even be that windy at Palm Springs, Victorville or Palmdale; Santa Anas happen when the pressure differential between the high deserts and the L.A. Basin force winds through the coastal passes like the nozzle of a fire hose. The air rapidly descending from the high (3000' MSL) deserts to the sea-level L.A. Basin also heats up and dries out, making it dangerous fire weather. If you live downwind of areas of dry brush, you sleep with one eye open and have valuables ready to gather up and throw in the back of the car.
Some locals also call it "earthquake weather." I don't know of any scientific connection, but the three largest L.A. earthquakes in the last 50 years (Sylmar, M6.7, 2/9/1971; Whittier Narrows, M5.9, 10/1/1987; Northridge, M6.7, 1/17/1994), all happened during Santa Anas.
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