The fire weather watch that’s been forecast has been replaced with to a red flag warning for most of Northern California. It will be in effect from 5AM Wednesday morning until 5PM on Thursday. Due to low humidity and strong winds, the fire danger is extreme.Cal-Fire firefighters are staffing up and preparing for the forecast of extreme fire weather. The National Weather Service says this will likely be the strongest offshore wind event so far this season. PG&E has alerted customers of possible public safety power shutoffs, which has prompted at least two school districts to announce closures. The Anderson Union High School District and Cascade Union School Districts have announced there will be no school Wednesday or Thursday.