Extreme winds and low humidity levels continued across much of southern california today.... as firefighters continue their fight against multiple fires - from simi valley, to san bernardino. Some "Red Flag Warnings" - which have been in effect in many areas this week, are set to expire tonight. When we hear there is a “Red Flag Warning”, we know there is high fire danger. But who issues the warning and why? And what should we do? KCSB’s Ray Briare explains.