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Radiosonde Wind Vectors: In all plots winds speeds are in m/s. The horizontal wind vectors are plotted with arrows the whose length is proportional to the wind speed. The length of a standard wind vector of 20 m/s is shown at the bottom of each plot. Arrows pointing down indicate wind from the north, Arrows pointing right indicate wind from the west.
U.S.Dept of Commerce / NOAA / OAR / PMEL / Atmospheric Chemistry