Isotachs

Isotachs are found on a weather map and are used to show different wind speeds. This map is of Mexico and the western United States. When the Isotach lines are close together, that is where the wind is the strongest.

source: https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg_5n0X-wfHBcjLpLDEcIk8wAJABgOru2-9FaERjViIxSDIcwiMORhdn5-cPqHtF8rknSWGvtpA_BdLllNj8TORLZ6wZ72PWBsaBnf2IyvvFmYpBP7o8Dnqjs1Npsesd4HSN6xZAXNaPDI/s320/isotachs.gif