As a retired professional pilot followed by ten years forecasting weather for glider pilots and a bird watcher to boot......that's all b-llocks.
The only possible justification for that instruction is the fact that birds do sometimes follow insects that get sucked up under cunims.
Mind you, my former airline produced a similar "classic". Instructions to the effect that bird strikes were more likely in the autumn as "birds like to rest on the still-warm runway". Bird strikes might indeed be more prevalent in the autumn & winter but for a totally different reasons - migratory visitors such as Lapwings and Fieldfares often frequent the grass at the runway edges as it provides excellent feeding.
Jack
Last edited by jackharr; 16th May 2008 at 13:22.