Purple is a wind warning cozie. It means winds expected of up to 80 miles per hour. If a fire breaks out, it will explode and move at uncontrollable speed. A purple wind warning has never been issued in California before.
For practical purposes it means that IF winds are that fierce and fire breaks out there's a good chance that rescue personnel may not be able to get to you or may have been given orders not to enter an area, even to effect a rescue.
My friend who lives near Napa told me that during evacuations her coworker was told by the office that once the police serving the evac orders had notified everyone that they (the police) were leaving the area and they would not come back, even for 911 calls.
I'm sure that the Trumpettes so inclined are saying that it's 'God's punishment' for the Sodom and Gomorrah that is Southern California. 