# 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="/immerse/measures-and-dimensions#dimensions">Dimensions</a></td><td>0</td><td /></tr><tr><td><a href="/immerse/measures-and-dimensions#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

![](https://files.buildwithfern.com/heavyai.docs.buildwithfern.com/heavyai/5da49f783fced5887083ebf3dee39beada4568ecaa676e7d5ff73ae689cddb07/docs/assets/3_wind-barb-1.png)

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.

![](https://files.buildwithfern.com/heavyai.docs.buildwithfern.com/heavyai/3a926cf4db5b30edb5d4dfd962a011cb4806049f26a082d57b791d21f905e6c5/docs/assets/3_wind-barb-2.png)

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.

![](https://files.buildwithfern.com/heavyai.docs.buildwithfern.com/heavyai/f3ce172385ca169a9d0d228052bee688641550d9c2898740008fad505a291cf0/docs/assets/3_wind-barb-3.png)