Isotachs

Isotachs are very similar to isobars. Instead of connecting areas of equal pressure, the Isotach maps connect areas of equal wind speeds. In the map above, the wind speeds are shown by intensity using darker shading. The darker the area means the higher the wind speed is. The things in the map that look like F's are which direction the wind is going. http://www.erh.noaa.gov/btv/events/28Oct2008/ua2.php