Isotachs are similar to isobars, however they are continuous lines that attach areas of the same wind speed. This image shows isotachs as well as heights. The solid lines acts a s a topograph in that they connect areas of same height, the dashed lines are the isotachs showing the similar wind speeds.
http://eumetcal.meteo.fr/euromet/resource/nwp/n8400/n8400004.gif
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