I've never grown watermelon before, but I took the plunge this year
(Petite Yellow from Seed Savers).

The first melon is getting to softball sized and I realize that I
don't know how to tell when a watermelon is ripe. These are the
small sort (in case that wasn't obvious from the name).

Any hints?

--
Drew Lawson

". . . And I never give a reason"
-- God, as channeled by Seven Nations