cloudy day but very light drizzle, Went up to patch 8 shingles, i had rain pants on but just a regular coat, Was just starting and on my cushion and it dumped on me with hail, I had no time to get off and no jacks under me so i figured i would fight through it and get it done, I was completely soaked got down and the sun came out, In 10 minutes went from cloudy to rain to hail , to rain back to sun and i missed timed the whole thing. I had to stay up there on my cushion as it was to slick to get back down, I cant believe it happened so fast. Yes i know i should have put roof jacks under me. Im surprised i got caught i keep an close eye on the weather.