http://seakayaking.wordpress.com/2006/11/
Isobars represent lines of equal atmospheric pressure. In isobaric maps, winds flow counterclockwise around lows, clockwise around highs, and parallel to isobars. The closer the lines, the stronger the winds and the further apart the lines, the weaker the winds. The dashed lines are the geopotential heights, where 500mb of air pressure is reached. People had to seek shelter from these 20 knot winds while sea kayaking in Japan.
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