Powerful winds and hundreds of lightning strikes from thunderstorms rattled eastern Oregon and Idaho Wednesday afternoon, cutting power and stoking fires, including one in Oregon that is already the largest active blaze in the nation.

The Durkee Fire, burning near the Oregon-Idaho border about 130 miles (209 kilometers) west of Boise, Idaho, caused the closure of a stretch of Interstate 84 again Wednesday. Amid rapidly forming storms in the afternoon, the blaze crossed the interstate near the town of Huntington, home to about 500 people. It also merged with the Cow Valley Fire, another large blaze that had been burning nearby, Gov. Tina Kotek said.

“The wildfires in Eastern Oregon have scaled up quickly,” Kotek said in a news release Wednesday evening, calling it a dynamic situation. “We are facing strong erratic winds over the region that could impact all fires. Rain is not getting through. Some communities do not have power.”