Thursday started off brutally cold in Chicago, with wind chills dipping below zero, but what exactly does that mean and how is it calculated? A wind chill is the "measure of how cold the air feels on ...

Tuesday morning's cold weather advisory may have passed, but the National Weather Service forecasts freezing cold temperatures will linger in Milwaukee into Wednesday morning — with wind chills ...

EPA, or Effective Projected Area, measures the size of the cross-sectional area of a fixture and its components as seen by the wind. This determines the overall strength of a fixture and the amount of ...