1) A wind of 20 knots corresponds to an approximate speed of:
2) What is the approximate speed of a 25-knot wind, expressed in kilometres per hour?
3) What is the approximate speed of a 40-knot wind, expressed in m/sec?
4) What is the approximate speed of a 90 km/h wind, expressed in knots?
5) What values are used for the forecasted wind at higher levels?