Wind rose

CLIMATOLOGY

1. WIND ROSES Wind rose is a graphic tool to give a short view of how wind speed & direction are typically distributed at a particular location. Wind roses were followed after compass rose. Compass rose is a fig on compass, to display orientation of cardinal directions & intermediate or intercardinal directions. COMPASS ROSE Cardinal directions – N,S, E & W Intercardinal direction – NE, SE, NW, WS. Secondary intercardinal - NNE, ENE, ESE etc.

2. The modern wind rose used by meteorologists gives the percentage of the time the wind blows from each direction during the observation period. Concentric circles represent percentage of time. PARTS The numbers around the outside edge of the circle represent compass points. N

3. The colour bars of the wind rose refer to the speed of the wind in miles per hour (mph) Concentric circles – time % Nos around – compass points ( direction). Colour bars – wind in mph.

4. Using a polar coordinate system of gridding , the frequency of winds over a long time period is plotted by wind direction , with color bands showing wind ranges. The directions of the rose with the longest spoke show the wind direction with the greatest frequency. Great frequency Low frequency Useful representation coz a large quantity of details summarized in a single plot. 8 points of compass can be used to record the direction of wind, 16 points can be used for more accuracy. 16 points are used

5. Include the wind patterns in a particular place of interest. Include also the instruments used to measure winds. Include the maximum tabulated wind velocitiess in Japan/ India. Monthly, yearly and over the decade etc. Any particulary devastating winds may be included with sketches if available.