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OLYMPIC NATIONAL FOREST, Wash. -- The wildfire burning in the Olympic National Forest grew to over 600 acres Thursday as Western Washington remained under a red flag fire warning.

The Big Hump Fire continues to burn along steep terrain in a remote area of the Brothers Wilderness Area. The area is inaccessible on ground, so fire helicopters are dropping water onto the area.

The Duckabush and Mount Jupiter Trails are currently closed to hikers. Since the area is remote, no homes are threatened.

Firefighters plan to focus their efforts on containing the fire north of the Duckabush River and east of the Olympic National Park boundary and prevent it from reaching any structures.

Western Washington under rare red flag fire warning

Meanwhile, Western Washington is currently under a rare red flag fire warning. The warning extends from the Olympic Mountains to the Cascades and is in effect until Wednesday night.

Firefighters say high temperatures, low humidity and strong winds are creating the perfect conditions for wildfires. Thunderstorms are also likely during a red flag warning.

Firefighters say conditions are ideal for a big fire in the next two days. The fire danger will remain high for several days after that.

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