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.

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

On Friday at 6:16 a.m. a freeze warning was issued by the NWS Los Angeles/Oxnard CA. The warning is for Southern Salinas Valley, San Luis Obispo County Interior Valleys, Santa Barbara County Central Coast Beaches,