A conventional red flag warning — which warns of severe wildfire behavior if ignition occurs — remains in effect for large portions of L.A., San Diego, Orange, Riverside, San Bernardino and Ventura counties, as well as some mountainous areas of Santa Barbara and San Luis Obispo counties.

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.