Calmer or no winds also contribute to better conditions. Strong winds give oxygen to flames and can dry out vegetation, making it more combustible. While fires will continue even with no wind, they don't spread as easily, making it easier for firefighters to put it out or for firefighting planes to fly overhead.

A beefed-up firefighting force was staged around Los Angeles to attack flare-ups or new blazes and anxious residents prepared for more fire danger as winds began to build Tuesday, a week after two