Cooler temperatures are allowing firefighters on the Carlton Complex to directly attack the flames.

Fire spokesman Pete Buist says the biggest wildfire in the state's history remains at 52 percent contained.

Firefighters are attacking the actual perimeter of the fire thanks to temperatures that are forecast to reach only the 70s and wet conditions left over from Wednesday's thunderstorms.

Buist says firefighters earlier this week could not get close to the perimeter because of high temperatures and strong winds.

However, the weather forecast calls for hot and dry conditions to return over the next few days.

The fire in north-central Washington remains at about 391 square miles.