DENDROLOGY

Detailed explanation-1: -range between 40 and 55 percent under most situations where the landowner is conducting a prescribed burn without professional assistance. Burning when relative humidity drops below 30 percent can become dangerous even for experienced prescribed fire crews.

Detailed explanation-2: -Brush piles should be burned when wind speeds are less than 15 mph and not gusty. Also, wind direction should be considered to keep embers and smoke from becoming a problem downwind. Burning brush piles when relative humidity remains greater than 40 percent can reduce the chances of embers igniting spitfires downwind.