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(dailynews.com) he National Weather Service has issued red flag warnings for most of Southern California that will go into effect as strong and gusty Santa Ana winds develop late Sunday and early Monday.

“Very low relative humidity, coupled with the strong and gusty winds will pose a critical fire weather threat,” forecasters said.

The warnings will be in effect until Tuesday morning. One covers the San Bernardino County mountains, the Inland Empire below the Cajon Pass and the Santa Ana Mountains and foothills; another covers the mountains of Los Angeles and Ventura counties.

The weather warning prompted the closure at 6 p.m. Sunday of Glendora Mountain and Glendora Ridge Roads from the Glendora city limits northeast to Mount Baldy in the San Gabriel Mountains, according to an Angeles National Forest tweet.

Winds coming from the northeast to east are expected to strengthen Sunday night to 25-35 mph, with gusts up to 55 mph, according to the red flag warning for the Inland Empire and Orange County. The wind won’t be quite as fierce in Los Angeles County — gusts up to 40 mph are expected.

Those conditions should continue through Monday evening, and then the winds will start to weaken, the red flag warning says.

Angeles National Forest staff works with Los Angeles County Department of Public Works when there is a high fire threat, such as a red flag warning or Santa Ana winds, forest spokesman Nathan Judy wrote in a statement.

Closing roads is done in an effort to decrease the threat of new fires starting, Judy said.

The estimated closure end date is Wednesday, according to the county roads website.

The closure likely will increase traffic from the Mount Baldy village south on Mount Baldy Road into Claremont and San Antonio Heights, officials said.