WRAL WeatherCenter Blog

Wake Co. was under a warning re' conditions for brush fires recently. What is the minimum relative humidity and the corresponding wind speed (minimum?)needed to eliminate the need for fire warnings?

Posted March 14, 2007 10:17 a.m. EDT

MIKE MOSS SAYS:      Dee,   The bare bones answer to that is a relative humidity greater than 25% and sustained winds less than 20 mph, when referring to a "Red Flag" warning for fire danger. For a little more background, see our recent blog entry on the subject at