Isotach

http://www.examiner.com/weather-in-baltimore/storm-maps-winds-rainfall-storm-location-flooding-coastal-wavespicture

A type of contour map...this map references the wind speed from the Central East United States to the North East United States on or around the date of March 13, 2010.  Contour lines can be seen and the use of colors are used to differentiate wind speeds in miles per hour (mph).