A week-old lightning strike that smoldered into flame likely started Grand Teton National Park’s most recent blaze on Sunday.

Teton interagency fire personnel responded to the four-acre Uhl Hill Fire around 3 p.m. as it burned east of Elk Ranch and north of Spread Creek. As of Monday morning, firefighters had contained 40 percent of the blaze, and they expected to have 100 percent containment by evening.

The Uhl Hill Fire comes as regional fire officials raise the fire danger rating to “high” for Bridger-Teton National Forest and Grand Teton National Park.

Thirteen firefighters with two engines were working to extinguish the fire. A helicopter was also supporting the effort by flying in supplies and dropping water. Officials tried to send in smoke jumpers but strong winds prevented them.

According to Grand Teton spokeswoman Jackie Skaggs, the Uhl Hill Fire is burning in the Eynon Ridge prescribed burn area, which has helped contain the flames. Fire personnel burned the 806-acre Eynon Ridge last October to eliminate fuels and benefit the ecosystem.

“Because of the previous treatment, it [the Uhl Hill Fire] stayed small,” Skaggs said.

Skaggs said fire officials decided not to allow Uhl Hill to burn to promote forest health because they wanted to make sure it was under control early.

“Due to multiple area fires and limited firefighting resources that are already attached to other area fires, the decision was made to suppress this fire,” she said.

Meanwhile, the Horse Creek Fire in Bridger-Teton National Forest was approaching 1,200 acres Monday afternoon with 17 percent containment. Bridger-Teton officials are bringing in a fire management team — experts in coordinating wildfire responses — to help with the blaze, which is in Sublette County west of Merna and 40 miles southeast of Jackson.

The Nylander Creek Fire, south of the Horse Creek Fire, is 100 percent contained at four acres. Bridger-Teton spokeswoman Mary Cernicek said an engine is remaining at the Nylander Creek site in case the blaze reignites.

High winds and temperatures have firefighters worried as the Fourth of July holiday approaches.

“People are not allowed to use fireworks on public lands,” Skaggs said. “It’s imperative that people follow that rule. Conditions are dry, we’re in a persistent drought and we’ve had afternoon winds picking up. ... All of those conditions can lead to the potential for increased fire activity.”

Already, Skaggs said, people have left campfires in Grand Teton smoldering.

“That is not a good practice,” she said. “You need to make sure they are dead and out and cold to the touch.”