The CAL FIRE Mendocino Unit will be conducting prescribed burns on the Shamrock Ranch in the northern portion of Mendocino County, east of Highway 101, and south east of the town of Laytonville and at CAL FIRE Mendocino Unit Headquarters, in Willits, starting today and running through the week 9 am to 4 pm each day weather permitting. Smoke is expected to be visible in the area.