Hey Speed Racer,
I would guess that Your failure occured before you turned off the motor or it got very very cold for North Carolina. In general if your engine freezes it will push out the freeze plugs. It's got to get below 0F usually if that's to happen.
But it sounded like you had some antifreeze in the radiator. When you've got some time put some water, or light antifreeze mixture and drive the car until it warms up, and look for the leak. A failed water pump will appear as a spray of water from behind the pulley drive flange.
If You require a replacement pump make sure the impeller inside the replacement pump is the same size as the one that came with the car.