CalFire has announced it will conduct a prescribed burn for vegetation management at the Shamrock Ranch today. The burn will cover some 600 acres. The Shamrock Ranch is in the northern part of Mendocino County east of Highway 101 near the town of Laytonville. The burn will continue through Sunday, with burning starting at about 10 a.m. each day and wrapping up at 5. Smoke, flames, and fire personnel may be seen in the area.