Did a Tampa turn today. The flight down was uneventful even though we had to cross three jet streams.
On the return leg we noticed a significant build up along our track over Georgia. We received a datalink from dispatch stating a Sigmet (significant meteorology) was issued for thunderstorms in the Savanna area. They were topped at 42,000 feet with possible one inch hail. We were on vectors departing from Tampa and then the controller clears us direct Savanna. We told him it would take us directly into the storm. We both saw things were clear upwind of the"build up" so we wanted to head west. Any pilot knows to stay upwind especially when there was a jet stream clocked at 120 knots. In other words, the CB would have moved quickly over our track even though we were "painting it" about 10 miles away. We climbed to 35,000 and the tops were well above. We entered the cloud and got the shit kicked out of us. Lucky I called the F/As ahead of time and they secured the carts. They said they just made it back to their seats. I assumed ATC had other aircraft go through the area so I thought it would work out. Never again, next time we go where it makes sense. Not downwind of a CB topping at 42,000 feet.