# 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.

Features	Quantity	Notes
Features	Quantity	Notes
Required Dimensions	0
Measures	Maximum of 6; 4 are required.	Lon, Lat, Speed, and Direction are required.

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

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.

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.