The full-fledged watermelon season is right around the corner, and in preparation watermelon prices are on the rise, up 20 percent over the previous week, according to ProduceIQ. Mark Campbell, founder and CEO of ProduceIQ, said short supply on both coasts is the reason for the elevated prices — at a 10-year high for the fourth consecutive week. “Import volume is historically low, and domestic production won’t be able to provide relief for at least three more weeks,” he said.