We left Southern California in 1993. At the time we lived up a canyon road (Sutton Valley, Oak Park/Agoura Hills, Ventura County). We once watched a fire roar through the canyon and miraculously stop half way up our hill.
Because I traveled a lot for business I told my (now ex) wife if there’s a fire issue leave. It’s not just the fire. You’re not safe until you get to the end of the canyon where there are three road options instead if only one. You don’t want to get trapped in traffic on one road.
You can watch Channel 9 in LA on Pluto listed under CBS LA. Last night I saw people stuck in traffic jams because they waited until they felt they had no choice but to leave.