B issue no . 3 or no . 8 signal as the case may be when half or more anemometers in the reference network register or are expected to register strong winds or gale storm force winds and the wind condition is likely to persist B发出3号或8号信号的准则为参考风力站网络内半数或以上的测风站录得或预料录得强风或烈风暴风，且风势可能持续
