Ferocious winds that drove the flames and led to chaotic evacuations have calmed somewhat and are not expected to be as powerful during the day, possibly allowing firefighters to make progress reining in blazes that have hopscotched across the sprawling region,

Major fires have killed five people, ravaged communities from the Pacific Coast to Pasadena, and sent thousands of people frantically fleeing their homes.

News Storm Team Meteorologist Chris Bouzakis has a look at what the Santa Ana winds are and why they are helping these fires become so destructive.