The weekend’s rainy weather is expected to quickly give way to windy conditions ripe for wildfire by late Sunday evening, prompting the National Weather Service to issue a Red Flag warning for parts of Southern California, forecasters said.

By late Sunday evening, Santa Ana winds of 20-40 mph — with isolated gusts up to 70 mph possible in some areas — were expected to move into the Inland Empire and much of the rest of the region. Humidity was expected to drop rapidly to 5-10 percent on Monday as well.

The Inland region will first be placed under a high wind watch at midnight Monday morning, and then will be placed under a Red Flag warning from 3 a.m. Monday to 8 p.m. Tuesday.

Los Angeles County will be placed under the warning a little earlier, at 10 p.m. Sunday.

The warning will affect mountains and foothills below 6,000 feet and inland valleys, but the conditions could cause fire to spark anywhere.

Moisture from the rain on Friday and Saturday will help to alleviate the fire threat, but fuels will dry quickly on Monday, NWS forecasters said.

Regardless of the fire danger, the winds could down trees and make driving difficult for high-profile vehicles, like semi-trucks.

Winds were predicted to gradually decrease Tuesday night and Wednesday, and conditions will be warm and sunny the remainder of the week, forecasters said.

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