Isotachs

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

Isotach maps display lines that represent equal wind speeds. The closer the lines are to each other, the steeper the change in wind speed and the further apart the lines the more gradual the change in wind speed. This is a map of the continental United States, it can be seen that there is higher wind speeds in the northeastern area.