Red Flag Warning Issued for L.A. County Mountains

A small Santa Ana wind system will blossom Sunday and Monday, causing Red Flag Warnings for all of the mountains of Los Angeles County. 

The National Weather Service issued Red Flag Warnings for the mountains of Los Angeles and Ventura counties as of 7 p.m. Sunday, and extended those warnings to the Santa Monica Mountains and Malibu regions effective at 10 p.m. Sunday. In those areas, wind gusts of up to 40 miles per hour were likely to blow into Monday afternoon.

Fire danger will be elevated in the mountains, as temperatures will be about 85 and the humidity levels will drop below 12 percent, the National Weather Service said.

Here is the forecast for Glendora:

MONDAY: High 93; Low 58

TUESDAY: High 88; Low 56

WEDNESDAY: High 82; Low 55

THURSDAY: High 71, chance of rain; Low of 49, chance of showers.

For the rest of the Southland, clear skies and warm air is predicted. Beach-area highs are forecast to be in the lower and mid 70s.

On Monday, beach highs could top 80 degrees in spots. 

The balmy weather should continue through Tuesday, when highs are forecast to be in the upper 70s at the beaches and the upper 80s in the valleys and inland areas.

Wednesday should be cooler but sunny, then increasing clouds Thursday night will bring a 20 percent chance of rain -- snow at the highest elevations - - by early Friday, according to the NWS.     

An upper-level high pressure system over California, coupled with surface high-pressure over the Great Basin, is responsible for the offshore airflow and warm, dry conditions.     

The red flag warnings and fire weather watches were canceled because NWS models indicated conditions just shy of warning levels -- gusts exceeding 35 mph, with relative humidities less than 15 percent, persisting for more than six hours.