A wind rose map is a map used by meteorologist to help determine the wind speed and direction. The map is measured using concentric circles. Each circle represents a different speed or frequency of the wind. The direction of the spoke shows the direction of the wind. The map shows data on the average wind speed and direction for a particular length of time. A key is used with different colors, much like a Doppler radar, to show the differences in wind strength. The example wind rose pictured above shows the wind direction and speed for Hurricane Frances and Jeanne in August of 2004.
http://www.plantmanagementnetwork.org/pub/php/research/2006/canker/
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