I rode through a thunderstorm this morning. It wasn't bad. Heavy rain, thunder and a little lightning. The wind wasn't bad. High winds are really my only real concern. Other than that, everybody on the road slows down, and the bike trail is vacant. When it's warm, I don't wear a rain jacket or anything. I just get wet and change out when I get to work. When it comes to severe weather though, big thunderstorms generally pass through within 30min or so, so it's easy just to wait out the real **** weather. I have been burned by trying to beat big storms, so now I air on the side of caution and wait for them to pass even if that means waiting an extra hour.