I gather that question is aimed at “PKPF68-77’s” hobby of gazing into the yonder with very sophisticated radar systems?
As we poor mortals well know, Helicopter Radar Receivers are not very capable of detecting “Dry Hail”….in fact if your radar is a little “weak” and/or there is light rain in front of the “Dry Hail” your radar may not see the Hail until it comes a knocking on your radome.
Consequently don’t fly downwind of an active CB with a high anvil, as the upper winds may blow that hail out of the CB into “Blue Sky’”. Right where you felt pretty safe!
Wet Hail will appear in the same way as Rain, whereas Dry Hail maybe invisible, or at least, a much reduced return.