How to build a wind rose

A wind rose is called a circular vector diagram showing the direction of wind motion within a certain period. Such graphs are widely used in meteorology, climatology and also in the construction of runways, airfields, housing estates and industrial zones. Stylized image of a wind rose is often used in heraldry. Today it can be seen in the symbolism of NATO or old geographical maps. But unlike these diagrams, a stylized image all rays of equal length.

You will need

Calendar, weather, diary, lined paper, ruler, pencil, Excel spreadsheets

Instruction

For training purposes the wind rose often study the lessons of local history and geography, as well as in building universities and colleges. To build a simple wind rose for a specific location is not difficult. This task is often performed by pupils of 6-9 classes.

In order to construct the wind rose will need the data of daily wind direction for month or more. This information can be obtained independently through daily weather observations, and you can also take in "Calendar of weather during the study period.

Then draw a chart to organize your observations. To do this, draw a coordinate system in which the principal axis will reflect the four main directions – North, East, South and West. Then, using the center coordinate further two axes and mark them intermediate directions: northeast, Southeast, Northwest and southwest. On each axis, put the uniform division, symbolizing the conditional number of days. If you are considering a monthly period intervals of the coordinates can reflect one day.

After you have completed the preparation work you can go directly to the construction of the wind rose. To do this, count the number of days during which the wind blew in a certain direction, and place them on each of the axes. The number of days each direction dot. Then carefully connect the resulting points with straight lines to make a closed polygon. The number of windless days (calm) mark in the circle the center of the diagram. If during the studied period of time in some of the areas of the world there was no wind, the connector in it should be interrupted.

The result you will get a wind rose for your area during the study period. Its rays will be unequal, and the longest of them will show the prevailing direction of winds in the study area.

To graph a wind rose is possible and the automatic way in Excel. To do this, create a file in which record in the table the available data on the number of days and the wind direction. Should have two columns: names and areas of the world with the number of windy days. Then in the menu "Insert" - "Chart" select the "Radar chart" and follow the advice of master chart. The result is a graphic image of a wind rose.

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