Title: +038=627.001-##001T_03-Fasadevasksystem NorAcon - International Code of Practice (ICOP).pdf
Weather forecasts usually give mean wind speeds. While this is useful information, it is O.2.1.8 very important to take predicted gust speeds into consideration when deciding whether work at height should go ahead or continue. If gust speeds are not known, the approximation gust speed equals twice mean speed may be used as a general guide for all heights up to 35 m. Twice the wind speed means four times the pressure. When comparing speeds quoted in forecasts, a general rule is that 10 m/s = 36 km/h = 20 knots = 23 mph.Even when the wind speed is considered acceptable to work in, it is likely to be windier O.2.1.9 higher up, as wind speed normally increases with height. In addition, various factors, e.g. building shape, can affect localized wind speed and direction, which can vary throughout a worksite. Wind speed can also be increased by being funnelled through gaps between high buildings, hills or other surrounding features.