The Latest: Red flag warnings go up in Southern California

LOS ANGELES – The Latest on Southern California’s heat wave (all times local):

11:30 a.m.

Red flag warnings for fire danger are going into effect Monday for mountains north of Los Angeles and to the west in Ventura County as well as the high desert Antelope Valley.

The National Weather Service says gusty onshore winds, very low relative humidity and hot temperatures will keep the warnings in effect until 9 p.m. Thursday.

Much of the rest of inland Southern California has elevated fire danger due to the continuing heat wave.

A large swath of San Bernardino, Riverside, Orange and San Diego counties are under a heat advisory and Imperial County in the southeast corner of the state is under an excessive heat warning.

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More high heat and elevated fire danger is in store for much of Southern California, especially interior areas.

The National Weather Service says the scenario is due to an upper-level high-pressure system combined with weakening onshore flow near the surface.

Triple digit heat is expected across the warmest portions of the valleys, foothills and lower mountains through Tuesday.

Forecasters say inland areas of the coastal plain will also be very warm, ranging from 85 to 95 degrees.

The heat, low humidity levels and very dry fuels will combine to raise the danger of wildfires.