PORTLAND, Ore. (KOIN) -- As conditions around the Flat Fire, about two miles northeast of Sisters, "continue to stabilize," a Red Flag Warning remains in effect Sunday as well as Levels 1 and 2 evacuations for portions of Jefferson and Deschutes counties.

The Flat Fire, which began August 21, has now burned 23,346 acres and is 39% contained, officials said Sunday.

More than 1,000 personnel have worked to contain the fire and the "primary control lines have held strong" despite some challenging weather.

Flat Fire — Facebook page from Jefferson County Sheriff’s Office Flat Fire — Facebook page from Deschutes County Sheriff’s Office

Firefighters from Lincoln, Washington and Lane counties were set to be released from the Flat Fire on Sunday, as officials are confident in the progress that'

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