LOS ANGELES (CNS) – Forecasters said a “strong and potentially damaging Santa Ana wind event” is expected across parts of Southern California this week.

A red flag warning for hazardous fire weather conditions is in effect in the valleys and mountains of Los Angeles County from 10 a.m. Monday to 6 p.m. Wednesday, according to the National Weather Service. A similar warning was issued for Malibu and coastal Ventura County from 2 p.m. Monday to 2 p.m. Wednesday.

Meteorologists reported strong Santa Ana winds and very low humidity. The Santa Anas are expected to strengthen late Monday and early Tuesday, with gusts of 50 to 55 mph in the mountains and valleys of Santa Clarita and San Fernando.

Temperatures will be cooler this week, with highs in the mid-60s across most of the county on Monday, rising a few degrees on Tuesday before falling back into the 60s for the rest of the week.

Overnight lows will mostly be in the 40s this week, but will fall into the 30s and even upper 20s in the Antelope Valley.