Isotachs

http://www.erh.noaa.gov/btv/events/28Oct2008/ua2.php

Isotachs are similar to isobars but instead isotachs group areas of a region with similar or equal wind speeds.  The image above groups areas across the southwest of the United States into categories of the wind speed.  The graph shows the direction and speed the wind is traveling and where the jet streams are located.  The blue and purple colors on the map show areas with stronger wind speeds and the strength of the wind speed can be identified using the key on the bottom of the map.