While on patrol Sunday, a backcountry ranger detected the lightning-ignited Wahb Fire near Cache Creek in the northeast corner of Yellowstone National Park
At a half-acre, current fire activity is minimal.
There are no closures in the area, and campsites and trails remain open.
Fire staff will monitor the fire, and if the Wahb Fire becomes more active, smoke may be visible from the Lamar Valley.
The Wahb Fire is one of four active fires in Yellowstone including the Pollux, the Wyodaho and the Brimstone.
Fire danger in Yellowstone remains high.