High quality Doppler radar can always catch Narrow-Band Echo(short as NBE hereafter). Normally, NBE reflects the existence of boundary convergence line.

• 灵敏的多普勒雷达经常能探测到弱窄带回波,这些弱窄带回波一般对应于边界层的辐合线,对弱窄带回波的仔细分析有利于及早做出强对流天气的临近预报以及对其发展变化作深入了解。