See Breeze: 3D Augmented Reality Wind Visualizer 1.1

the author of this app says:

Provides both a FLAT VIEW COMPASS and an AUGMENTED REALITY 3-D VIEW showing the local wind and weather conditions with animated wind vectors.

Ideal For:
- Aviators, Sailors, Surfers, Windsurfers, Kite Flyers, Cyclists, Fire Fighters, Weather Hobbyists and any other outdoor enthusiasts

Main Features:
- Compass view showing animated wind vectors for nearest weather stations with wind, temperature and humidity readings
- 3-D augmented reality view with animated wind vectors
- List of local observation stations (up to 10 nearest), from which any may be selected for individual wind viewing
- Map view of all local stations with weather arrows showing direction, speed and temperature
- Uses official Bureau of Meteorology data within Australia, and NOAA metar data (from airports) for rest of world

Feature Device Dependencies:
- iPhone - interface runs only in portrait mode, 3-D View is shown as an overlay on the camera view
- iPad - interface runs in any device orientation, 3-D View is displayed with an opaque background (due to absence of camera)

Notes
- The compass accuracy depends on having an undistorted magnetic field around your device. If you use it close to metallic objects or electrical equipment, directional accuracy may be impaired.

What's New in version 1.1

* v1.1
- Bug fix: Compass orientation could have been incorrect if device was rotated when in a different view, and then returned to compass view
- iPad: 3-D View may now be opened for any device orientation