For previous wildfires I've packed the truck days in advance. As explanation, wildfires usually start well east of here and give days of preparation time to anyone in my neighborhood. As for when to make the decision to leave: (1) when a mandatory evac is ordered, or (2) when the fire's vector (path and speed) put my home in the path. This is a neighborhood by neighborhood, sub-division by sub-division, ravine by ravine thing.

Fires can move fast when the wind kicks up. A friend was in bed asleep when the fire dept folks knocked on his door and gave him 15 minutes to leave. He hadn't packed because when he went to bed it was not threatening his sub-division. Things change and they can change fast.

Pack early and be ready to be given a 15 minute warning.

How about you. When do you push off or weigh anchor when a tsunami threatens? Go to high ground or head to sea?