What causes tomatoes, on the vine, to split at the top before they're ripe?

actually it is too much water after a dry period! If a tomato is used to getting a gallon of water every evening it will not split, but if it goes for say a week without and then you over water with say two or three gallons then,,, rip,,,, it will split

What causes tomatoes, on the vine, to split at the top before they're ripe?
not enough h2o
Reply:yes to much water..or to much rain !
Reply:its the heat i grow them all the time has nothing 2 do with water if u water every day in hot spell it will not happen
Reply:too much water
Reply:Too much moisture.
Reply:I agree..It has nothing to do with to much or to little water.
Reply:Too much water, then too much heat or sun.