I've seen St Elmo's fire 2 or 3 times on Nimrods. Flying at night in proximity to CB's. Blue balls on the 4A fuel tanks and 'dancing' static along the leading edge. The pilots called it on the probe too. As Rossian stated, there was a large amount of static on the V/UHF radios. I let go of the metal handle on the beam window, despite what I'm told of faraday cages!!