Isotachs are lines of equal wind speed. They are most often contoured in the upper levels of the atmosphere, especially at the jet stream level. They are important for locating the jet stream and jet streaks within a jet stream. The green lines in the photo are the isotach lines, showing the different wind speeds along the latitudes of the US.
http://www.comet.ucar.edu/resources/cases/c2_06dec95/gif/250ht_isotach.gif
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