Mountain and valley communities in L.A. and Ventura counties were under a red flag warning Saturday as powerful winds and dry conditions persisted along with unseasonably warm temperatures.

The warning was extended through 8 p.m., the National Weather Service said. As of Saturday morning, more than 257,000 Southern California Edison customers could lose power in the utility’s efforts to prevent its equipment from sparking flames.

Several areas in the region saw record-breaking daily temperatures Saturday.

Camarillo broke its previous all-time high with 93 degrees, followed by Oxnard with 89 and downtown Los Angeles and UCLA with 88.

Strong and potentially damaging Santa Ana winds were expected Monday night through early Wednesday. The winds could down power lines and bring down trees, according to NWS.