Just as isobars are used to represent constant pressure and the change in that pressure through the use of lines, isotachs symbolize constant wind speed and the change in that wind speed by differing distances with lines. This particular map shows a snowstorm event that happened in the northeastern United States on October 28th and 29th of 2008. The data was taken at the 300 mb level of the atmosphere and shows how the jet stream dipped around this storm, spanning from the south of Canada into the deep south of the United States. Winds increased greatly in the southern United States as seen by the closely drawn together lines.
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