http://www4.ncsu.edu/~nwsfo/storage/cases/20030123/
Isotachs are lines in any given surface that connect points with equal wind speed. Like isobar maps, these are helpful in determining atmospheric and/or weather conditions. Any abnormalities in the isotachs can indicate the potential of having severe weather (i.e, tornados).
The isotach map shown above uses different colors to show equal - and different - areas of wind speed.
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