Crews on the ground and in the air were battling a 150-acre wildfire in the backcountry of Yellowstone National Park on Monday.

When the "Beach Fire" was reported Sunday morning it was less than an acre in size, but gusty winds and plentiful fuels helped spread the flames, according to fire bosses.

The fire was burning in a stand of alpine fir trees in an area about 7 miles west-southwest of Bridge Bay Campground and about two miles south of Beach Lake. It was not threatening structures, campgrounds or roads. But the likelihood of it growing into a major fire spurred the decision to battle the flames, the park reported.

Two helicopters from the Gallatin National Forest, an air tanker from Helena, Montana, and a second airtanker from Pocatello, Idaho, were called in to augment Yellowstone National Park firefighters and the park’s contract helicopter in their efforts to suppress the fire, the park reported.

On Monday the three helicopters and two air tankers were scheduled to resume their suppression efforts, with the Helena Hotshots and the Lewis & Clark Hotshots working the fire lines. The plan was to coax the fire into meadows and toward the west side of last year’s Arnica Fire.

The forecast called for a chance of afternoon showers or thunderstorms with gusty west winds, high temperatures in the upper 60s to low 70s, and humidity dropping Monday afternoon to 18-24 percent.