SEATTLE — SEATTLE — The National Weather Service has issued a red flag warning for a high level of wildfire danger on Wednesday over much of Washington’s Cascade and Olympic mountains. The weather service warns that a combination of low humidity and warm temperatures could create the potential for explosive fire growth.

On the Olympic Peninsula near Port Townsend, fire crews have contained a wildfire that burned about 30 acres. That fire had threatened several waterfront homes, but state Department of Natural Resources spokesman Bryan Flint said no homes were lost.

Also on the Olympic Peninsula, a 150-acre wildfire has closed the Duckabush and Mount Jupiter trails in the Brothers Wilderness Area. No structures are threatened by that fire.

Both fires are believed to be human-caused.