Santa Ana winds are whipping Southern California on Tuesday, sparking fresh fears that progress made fighting wildfires that have scorched over 40,000 acres and left 27 dead could be reversed and more blazes could break out.

The NWS Los Angeles/Oxnard CA issued a wind advisory at 12:54 a.m. on Wednesday valid for Wednesday between 2 p.m. and 10 p.m. The advisory is for Southern Ventura County Mountains, Interstate 5 Corridor and Eastern San Gabriel Mountains.

Southern California will continue to face "dangerous fire weather conditions" including strong Santa Ana winds and extremely low humidity through later this week, forecasters said Tuesday.

With more critical fire weather this week in Los Angeles, the National Weather Service once again issued one of its strongest warnings possible.

A high wind warning was issued by the NWS Los Angeles/Oxnard CA on Wednesday at 12:54 a.m. valid from 10 p.m. until Thursday 2 p.m. The warning is for Southern Ventura County Mountains, Interstate 5 Corridor and Eastern San Gabriel Mountains.

Kelly Curran breaks down the fire weather forecast for Southern California on Jan. 20 at 6 a.m.