However, temperature criteria for an advisory or warning can vary from state to state to reflect regional climate differences. For example, weather forecasters in Grand Forks, N.D., issue a wind chill advisory when the wind chill is -25° F or lower for more than one hour, while a wind chill of +35° F for at least three hours will trigger a wind chill advisory in Miami.
"People need to stay inside as much as possible when we issue a wind chill warning,” Kellenbenz says. If you must go out, it is best to dress in several layers of loose-fitting clothing to create layers of insulating warm air. A water repellent, hooded outer garment can add extra protection, and a hat will prevent loss of body heat. Mittens are better than gloves at keeping hands warm.
NOAA's National Weather Service began providing wind chill tables in the 1970s. Those early values were based on a wind chill formula developed by Paul Siple and Charles Passel who explored the Antarctic from 1939 to 1941 with Admiral Richard Byrd. Wind chill formulas have since been refined with advances in science, technology, and computer modeling.
Copyright 2009 The E.W. Scripps Co. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.
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