The Gunbarrel and New Fork Lakes fires in northwest Wyoming grew substantially Thursday and Friday thanks to strong winds and hot temperatures.

The New Fork Lakes Fire, 19 miles north of Pinedale, gained roughly a thousand acres since Thursday, from 2,600 acres to 3,600 acres, as it continued to burn southeast into the Bridger Wilderness. Fire crews succeeded in building containment lines from New Fork Lakes to Little Flat Top Mountain and north of the Willow Creek Guard Station. The fire is now 2 percent contained.

Officials also reported another fire in the same vicinity dubbed the Blueberry Lake Fire. The blaze is just north of Boulder Lake and has burned about an acre. Bridger-Teton National Forest spokeswoman Mary Cernicek said fire personnel expected to contain the blaze by Friday evening. As with the New Fork Lakes Fire, the Blueberry Lake Fire was caused by an escaped campfire.

“Put your campfires out,” Cernicek said.

Bridger-Teton officials are asking that all visitors to the forest make a special effort to ensure their campfires are completely extinguished before leaving them unattended. A properly extinguished campfire is cold to the touch and ashes are thoroughly wetted with water.

“Leaving a campfire unattended is punishable by a monetary fine,” said Bridger-Teton fire prevention technician Nan Stinson. “If your abandoned campfire results in a wildfire, you could be held responsible for the cost of that blaze.”

Near Fishing Bridge in Yellowstone National Park, officials revised the estimated size of the LeHardy Fire from 600 acres to 505 acres after a reconnaissance flight Thursday afternoon. Officials have reopened the Grand Loop Road between Fishing Bridge Junction and Mud Volcano.

On Shoshone National Forest, the Gunbarrel Fire started about 38 miles west of Cody with a lightning strike June 26 and roughly doubled in size from 4,700 acres Thursday afternoon to about 9,500 acres Friday.

The fire has moved to within a half-mile of the Absaroka and Elephant Head lodges, and the owners of both businesses are asking their guests and employees to leave the area while roughly 70 fire personnel work to install sprinklers and other structure protection devices.

The blaze is burning in heavy timber and bug-killed trees along Gunbarrel Creek, a section of rough terrain that Shoshone fire officials deemed too dangerous for fire personnel to attempt containment efforts. There is a red-flag warning on the Gunbarrel Fire, meaning conditions are ripe for the fire to expand.

On Wednesday, Bridger-Teton National Forest and Grand Teton National Park raised the fire danger level from “high” to “very high” because of warm temperatures, low humidity and high winds.