01 What is Windspeed?

Wind speed – Wikipedia

Wind speed is the speed of the air relative to the ground. Usually, only the horizontal speed is considered.

More precisely, the wind speed is usually measured with a small rotating wind meter, the cup cross anemometer.

SymbolBeschreibungGeschw. in km/hin Knoten
Windless0-10
Light air2-91-5
Light breeze10-196-10
Gentle breeze20-2811-15
Moderate breeze29-3716-20
Fresh breeze38-4621-25
Strong breeze47-5626-30
High wind57-6531-35
Gale, frash gale66-7436-40
Strong, severe gale75-8341-45
Storm84-9346-50
Whole gale94-10251-55
Violent Storm103-11156-60
Hurricane112-12061-65
Hurricane121-13066-70
Hurricane131-13971-75
Hurricane140-14976-80
Hurricane150-15781-85
Hurricane158-16786-90
Hurricane168-17691-95
Hurricane177-18596-100
Hurricane186-194101-105

Wind speed is expressed in kilometers per hour, meters per second, knots, or miles per hour.

When wind speeds are not indicated by their measured value, they are usually classified according to the Beaufort scale, which is indicated by the use of the terms wind force (e.g. 5) or Beaufort (e.g. 5).