James McKinnell's Map Catalog
Thursday, July 14, 2011
22. Isotachs
http://celebrating200years.noaa.gov/foundations/aviation_weather/windstrm.html
Isotachs are lines that connect areas of the same wind speed. This map shows the surface windspeed for the U.S. on February 22, 2007. The arrows on the isotachs signify the direction of the air.
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