# Wind Barb

A Wind barb chart uses wind barb shapes to indicate wind speed and direction.

Speed is indicated using "flags" on the end of the barb:

* Each half of a flag depicts 5 knots (5.8 mph).
* Each full flag depicts 10 knots (12 mph).
* Each pennant (filled triangle) depicts 50 knots (58 mph).

Direction is indicated by orientation of the flags on the barb; the flags point in the direction of the source of the wind. For more information, see [Information about wind barbs](https://www.weather.gov/hfo/windbarbinfo) from the National Weather Service.

<table data-header-hidden><thead><tr><th>Features</th><th width="208.33333333333331">Quantity</th><th>Notes</th></tr></thead><tbody><tr><td>Features</td><td>Quantity</td><td>Notes</td></tr><tr><td>Required <a href="/pages/SDlz2Vb7QP7DF3xOL2rL#dimensions">Dimensions</a></td><td>0</td><td></td></tr><tr><td><a href="/pages/SDlz2Vb7QP7DF3xOL2rL#measures">Measures</a></td><td>Maximum of 6; 4 are required.</td><td>Lon, Lat, Speed, and Direction are required.</td></tr></tbody></table>

For example, the following Wind barb chart has these measures, using data set noaa\_gfs\_v from [NOAA](https://www.noaa.gov/):

* **Lon** - AVG longitude
* **Lat** - AVG latitude
* **Speed** - AVG a80m\_Wind\_Speed
* **Direction** - AVG a\_80m\_Wind\_Direction

<figure><img src="/files/PGHNsEvQaeOxjZXmqyKS" alt=""><figcaption></figcaption></figure>

You can increase or decrease the number of barbs in the right panel. Here, barb number is increased to the maximum to provide a more contoured visual.

<figure><img src="/files/m8GZ8UYJ7S3rXpfxX1St" alt=""><figcaption></figcaption></figure>

Using the optional Color measure, you can add more information to your Wind barb chart. For example, the following figure shows a **Color** value of a AVG a2m\_Relative\_Humidity to provide humidity information for the air, with yellow indicating areas of higher relative humidity. Adjust the **Color Palette** to change how the **Color** measure is represented.

<figure><img src="/files/9hITzpd7bPw0jYeWMeZI" alt=""><figcaption></figcaption></figure>


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