Wind Rose


Oh gosh, I’m so so bored & sleepy in the office right now. Though i maximize the volume of my ipod, I’m still sleepy.

I just sent my first scoping note for my second Project this morning & the copy of the report will be send to the client in Puchong this afternoon. I’m waiting for the ABX guy to come. LOL.

Currently I’m reading how to read the wind rose diagram. I supposed to know about this donkey years ago but didn’t bother to learn about it. Sigh. Now i HAVE TO know about it. So yeah, no choice. haha.

So what exactly is wind rose?

A wind rose is a graphic tools used by the meteorologists  to give a succinct view of how wind speed and direction are typically distributed at a particular location.


How do you interprete the wind rose diagram?  This is the explaination given by the Malaysian Meteorological Department:

The concentric circles in dashes of a wind rose represent the various percentage frequencies of time as labelled.  the innermost full circle represents the percentage occurrence of calm (wind speed less than or equal to 0.2 m/s), the value of which is inscribed within the circle.  Various arms radiate from the innermost circle.  The total length of each arm represents the total percentage frequency of time the wind blows from the direction concerned.  Each arm is again subdivided into a line and rectangles of different shades or sizes.  These represent the various classes of speed as given in the key scale.

 How do they obtain this kind of data?

Wind observations at the station are taken from pressure tube anemograph.  Wind direction is analysed according to 8 compass points.  The limits chose for wind speed correspond with the scale for Beaufort Force.  The source data used in the analysis are the hourly averages of wind speed and direction.

 So today, I’m a meteorologist. 🙂

One Comment Add yours

  1. glenn says:

    So in your wind rose diagram shown above the wind is blowing in the direction that the triangle points towards.. In this case the wind is blowing out of the northwest or towards the southeast. In your discussion above, it is not clear, at least to me, which way the wind is blowing.

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