CRAB
Check out the Met Office work on this.
Investigating and predicting helicopter-triggered lightning strikes - Met Office
Theire example map clearly shows overland hot-spots.
http://www.metoffice.gov.uk/media/im...n_radar_L2.jpg
After our cancellation due to triggered lightning risk I have had a look at work on this phenomenon and hope to get someone to do a piece on the subject for the Scottish Mountain Rescue magazine at some stage.
HELICOMPARATOR
Vertigo above 200'AGL? Wouldn't surprise me! However, whereas a Sea King has always tended to be flown through the glens, in an S-92 there is more of a tendency for folk to just fly across the top.
The science is still new. I would hope that in 5 years time there will be a finer honed forecast.