I once found a thunder storm between me and home base, a distance of 5-6 miles away, had a look to see if I could get round the side, no joy, decided to poke my nose into it to see how far it went, sudden serious turbulence nearly rolled me over, rain hit the screen I couldn't see through, a streak of lightning missed the wing tip by a few inches, all in the first few seconds. Smart 180 and call for diversion to nearest. Cup of coffee and a smoke and all was fine to go home.
Never again, 620 kg of wood and fabric at 2000ft, not the place to be.