Regional Weather
Santa Ana Winds Explained: Fire Weather, Dry Air, and Mountain Gaps
What Santa Ana winds are, why they are dry and gusty, and how they increase wildfire danger, travel issues, and power concerns in Southern California.
Quick answer: Santa Ana winds are dry offshore winds that blow from inland areas toward the Southern California coast, often through mountain passes and canyons.
Why they happen
Pressure differences between the interior Great Basin and the coast can push air downslope toward Southern California.
As air descends, it warms and dries, which can lower humidity sharply.
Why fire risk rises
Dry air, strong gusts, and dry vegetation can make fires start more easily and spread faster.
Wind direction can also push smoke and flames into populated areas.
Safety steps
Follow red flag warnings, avoid spark-producing activities, secure loose outdoor items, and be ready for power or travel disruptions.
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