Climate data and services
Potential wind speed: Explanation
The potential wind is
- wind that is corrected for the effects of shelter from buildings or vegetation.
- over land an estimate of the wind speed that could have been measured at 10 m height if the station's surroundings
was free of obstacles and flat with a roughness that is equal to that of grass (roughness length = 0.03 m).
- over sea an estimate of the wind speed that could have been measured at 10 m height over water with a roughness that
equals that of water in high wind speed conditions (roughness length = 0.002 m).
- more homegeneous both in wind direction, space and time as a result of the corrections compared to the measured wind speed.
- derived from hourly averaged wind speed; the wind direction is a 10-minute average which is not different from the measured
The potential wind is not to be used in court trials as it may be adjusted as a result of new investigations (see the third bullet under "The correction").
The correction is
- derived from a gustiness analysis of the stations series itself.
- a function of wind direction. This function can change in time.
- is not fixed for at least a few years to come; because of this the potential wind speed may also be adjusted.
Much more background information and also older wind speed series can be found at the Hydra website. This is a research website in English.