Conditions are favorable for firefighters trying to corral one of Wyoming's first significant wildfires this year.

The 300-acre wildfire is burning in a remote area 15 miles southeast of Casper, not far from Muddy Mountain. Lighting is believed to have started the fire sometime last weekend.

The fire has burned about 300 acres of mixed pine, grass and sagebrush.

Medicine Bow National Forest spokesman Aaron Voos said higher humidity and a chance of rain are forecast. Even so, firefighters have requested help from more ground crews and another single-engine air tanker.

Two water-dropping helicopters and a small air tanker are already working the fire.

Wet spring weather has helped to keep wildfires to a minimum so far this summer after last year's unusually busy fire season.