Sanders, Frederick Department of Meteorology, Massachusetts Institute of Technology, Cambridge, Massachusetts.
Bluestein, Howard B. Department of Meteorology, University of Oklahoma, Norman, Oklahoma.
Last reviewed:January 2020
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A line along which the speed of the wind is constant. Isotachs are customarily represented on surfaces of constant elevation or atmospheric pressure, or in vertical cross sections. The closeness of spacing of the isotachs is indicative of the intensity of the wind shear on such surfaces. In the region of a jet stream the isotachs are approximately parallel to the streamlines of wind direction and are closely spaced on either side of the core of maximum speed. See also: Jet stream; Wind
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