An inversion Wednesday caused smoke to settle and linger in the West Fork of the Bitterroot Valley and over North Fork, Idaho.

The smoke is from the 2,400 acre Chrandal Creek Fire, at the south end of the Bitterroot National Forest. There was active burning Thursday between Skook Creek and Chrandal Creek, which included single tree and group torching, according to the Thursday Update.

Today, crews are finalizing structure protection plans for the Alta area in Hughes Creek.

Five hotshot crews will be cutting a fireline along Skook Creek to get to a western section of the fire, and then hose and water pumps will be brought in for "direct attack."

And, the crews are keeping an eye on the sky. Thunderstorms are predicted for the next few days and firefighter safety is the uppermost concern.