Pat Robertson is nothing more than a liar, a VERY, VERY RICH and SUCCESSFUL liar and conman.
Pat Robertson has gotten rich by relying on the gullibility and ignorance of the average American Christian.
If Pat Robertson was simply as ignorant as his audience, it might be possible that he really was dumb enough to think that rain and floods equal a tsunami, but all indications are that he is not that ignorant. The only other possible explanation is that is is just a LIAR.
To your question:
To be considered a prophet or a false prophet what does one's batting average have to be?
I would think that ones batting average should be higher than zero at the least.
Is there partial credit for a prophecy? Does partial fulfillment count?
Is a bridge that gets only part way across the ravine a partial success?
Just how specific does a prophecy have to be.
Specific enough to do something about it before the event.
For example, can a prophet claim that god told him that there will be an earthquake in 2007 and some weather records will be broken.
They can and do and get paid handsomely for it. It is their stock in trade.
"This way to the egress folk."
Aslan is not a
Tame Lion