When looking at a wind rose, you'll see it's constructed with spokes coming out from a center point that show the wind direction each of the spokes are color-coded along their length to indicate the speed of the wind. In this case, 56% of the time, winds blew from the W at 5-15 mph. There are a number of different formats which can be used to display wind roses.
If the color representing 30 to 35 miles (48 to 56 km) per hour moves from about halfway between the 2 circles (indicating 25 hours) to the 30 circle, then the wind spent 5 hours of time at this speed from that particular direction, as you subtract 25 from 30 hours. You can learn the direction of the wind by reading the angle of the barb vector in degrees. Rose diagrams are useful in geography fieldwork to analyse data containing magnitude and direction values. To create a wind rose, average wind direction and wind speed values are logged at a site, at short intervals, over a period of time, e.g. The wind data should usually collected for a period of at least 5 years and preferably at 10 years so as to obtain an arrange data with sufficient accuracy. is the copyright holder of this image under U.S. The location should be listed at the top or bottom of the diagram. All tip submissions are carefully reviewed before being published, This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. %PDF-1.6%���� This image is not licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Usually, the central circle indicates calm conditions. The length of each "spoke" around the circle is related to the frequency of time that the wind blows from a particular direction. Presented in a circular format, the length of each "spoke" around the circle indicates the amount of time that the wind blows from a particular direction. Note: Available as an Autodesk® Subscription Benefit. Instead, just look at the numbers on the wheel and subtract them as you did with the percentage.
Last Updated: JEvery dollar contributed enables us to keep providing high-quality how-to help to people like you. In some cases, the key will give you extra information that you can use. Input a vector to be used as a true North direction for the wind rose or a number between 0 and 360 that represents the degrees off from the y-axis to make North. If a "spoke" is mostly one color, then winds blew mostly at the wind speed denoted by that color. The modern wind rose used by meteorologists gives the percentage of the time the wind blows from each direction during the observation period it sometimes shows the strengths of these winds and the percentage of the time calm air or light winds are observed.
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