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I have read that when a thunderstorm is in the developing stages, there is lightning but no rain. Heavy rain is during the mature stage of the thunderstorm, and continues while the storm is dissipating. So just because no rain does not mean no thunderstorm. You can get in some mean turbulence and lightning with no significant radar returns.
As a mechanic in the Air Force, I have repaired a number of airplanes that have been struck by lightning. It is quite damaging to the aircraft, and the crew seats have to be replaced, but I guess it very seldom brings down the airplane, even aluminum GA airplanes. On the other hand, I am sure you remember the picture I had up on the site of what a single lightning strike did to an unprotected composite airplane parked on the ground...
FWIW, I'm no expert.
Kevin
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