That’s leading to the creation of mountain waves, which arise when strong winds blow perpendicular to a mountain range. The waves shoot down the coastal side of the mountains, gaining speed along the way, and are more casually referred to as simple Santa Ana winds.

We've seen reports about Los Angeles County being under "fire weather watch" and "red flag warning." What is the difference?

Here's a guide to understanding "particularly dangerous situation" red flag warnings, containment, and other terms related to the devastating fires that have left much of the LA area in ruins.

The winds fueling wildfires in Southern California are beginning to ease, but the forecast calls for their return next week. Offshore Santa Ana winds will diminish Thursday, though a red flag warning remains in effect for the San Gabriel and Santa Susana Mountains.