Wind barbs are symbols on the map that show wind direction and speed at some specified location.
It is a familiar format for displaying the wind to all meteorogists, yachtmen and others. That's how it were drawn on the synoptic maps before, and so many people are used to seeing it. Now you can see wind barbs on digital maps, too.
The barb has three parts: a long line, an extra lines on the long line (called "feathers") and/or triangles also called "flags", and most often a dot.
The speed of the wind is correlates with the number of extra lines. The long extra line (long feather) is 10 knots (kts), short extra line (short feather) is 5 kts. A triangle is 50 kts.
The circle with no lines (and no extra lines and/or flags) instead of a dot simply mean no wind. It is used when winds are 2 kts (mph) or less.
The wind direction is the position of the line in 360 degrees. In other words, the wind blows from the extra lines and/or flags to the opposite direction — often dots.
In Windy.app wind barbs located in the nodes of the weather model grid — points on the map where the weather is predicted. This excludes interpolation (forecast errors) — the forecast is as accurate as possible.
In this implementation, it is a unique feature of Windy.app.
The wind barbs are from one of the 10 weather models used in the app. It's updated every three hours.
1. Go to the Wind Map.
2. Tap "Wind Barbs" button on the right side of the map after the HD Map feature.
3. Move map to see barbs in different areas.
4. To turn off the wind barbs tap the same button.
This is how it looks in iOS, for example:
Learn about other great features for sailors in the news "Three New Features of Windy.app in the Big Update for iOS Make It a Universal Weather App for Sailing".
Read all weather lessons in Windy.app texbook "Meteorogy in Simple Words for Windsports and Outdoor Enthusiast".
Barbs images and data from the US Naional Weather Service.
Cover photo © iammatthias / Unspash