isotach Map

http://3.bp.blogspot.com/_VCI4AaOLs-A/SEw1-oM2kjI/AAAAAAAAADY/Uolr25aQINM/s400/isotach.gif

This is an example of a isotach map. It shows the lines on a suface connecting equal wind speed. It is use to show others of expected wind speeds throughout a day or even during a storm.