3.When a cold front moves through an area, there is usually a temperature drop and a drop in the relative humidity. The lower humidity occurs because of the movement of a warm moist air mass to a cooler drier air mass. Relative humidity is a factor of prescribed burns that is dependant on all of the other factors. This is why it is not a good idea to try and predict fire behavior of a burn solely on relative humidity. Burns can be done at any level, but the recommended level promises better burns.
Temperature also plays a big part in how well a prescribed burn goes.
Image of a fire that has gotten out of hand. The temperature of an area can come into play when conducting burns. When temperatures are rising during early morning hours, this also creates conditions for unpredictable burning. Air temperatures between 70 and 90 degrees Fahrenheit are ideal when you desire complete burns in the area. 3.Large areas of smoldering fires.