I've had this same problem recently, and could not see exactly where it was coming from. It seemed to be coming from near the water pump and I suspected a leaking gasket (none of the hoses were leaking and the thermostat was not the problem). I had been putting off the repair, until now. My wife was driving yesterday when the Jeep started making sounds and water pouring out all over. I did not get to hear it, but have now removed the pump and it looks like it's done for. I am in the process of replacing it, hoping it's the problem and the leak will be gone too.
I also have an oil leak from the same area, possibly coming from around the timing chain cover gasket. While I'm this far into it, I am going to replace that as well, although removing the bolt for the pulley is kicking my #@*. Also considering replacing the front oil seal?