Low - level windshear and turbulence alerts for the approach and departure areas within 3 nautical miles of the runway thresholds are issued by the amo for relay by air traffic controllers to approaching and departing aircraft 机场气象所发出在跑道进口3海里内的机场升降区的低空风切变及湍流警报，由航空交通管制员转送至正在升降的航机。
