Red flag criteria is generally when relative humidity is at 15% or less, combined with sustained winds and/or gusts of 25 mph or greater. Both of these conditions must occur simultaneously for at least 3 hours in a 12 hour period, according to the NWS.

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.

Dangerous fire weather conditions and poor air quality are expected to stick around until the weekend. Here's what to know in Orange County.

Amid an already dry winter season, the first Santa Ana wind event of 2025 is elevating fire danger this week and threatening power shut-offs for thousands of San Diego Gas & Electric customers.

Dire warnings have been issued for the Los Angeles area, with a dangerous threat for the strongest wind event in more than a decade. Outages and extreme fire behaviours are major risks