We've got some tomatoes out in our garden! A hot, dry summer made them grow well.
But they crack and split open sometimes. That's weird.
I found a source in Better Homes and Gardens (August 2010) which says that, "A prolonged dry spell followed by rain can cause ripening tomatoes to grow so rapidly that the skin splits. To prevent this malady, maintain constant soil moisture. Water deeply and mulch around plants to reduce evaporation."
Interesting! Guess I should have been watering more regularly all summer! We'll eat them anyway.