In sub-tropical areas of the world, there are many occasions where lightning conditions exist hand in hand with a flying task and yet, as far as I am aware, there have been no lightning strikes to helicopters flying in these conditions – and they do, either inadvertently or in a no choice situation. However, on the North Sea for example, as most are aware, lightning strikes are a significant hazard, even in clear air. It may be there is a relationship between humidity/temperature and other meteorological factors that can significantly reduce the possibility of a strike. If this assumption, and that’s all it is, is generally correct, is anyone aware of any research that has taken place regarding this aspect?