The OT can be used as a sort of historical reference and time line. The flood that is recorded elsewhere, but perhaps the probability of flooding is the issue as we have seen in this country recently. But we know now that flooding is caused by weather systems. Humans have tried to divine what the weather is going to be by watching the reactions of plants and animals and when Earthquakes or eruptions will take place? That is where the probabilities come in. These used to be remitted as acts of god, however no matter how much we understand the science behind these things it's a matter of If and when these things happen that is important to humans, not the science behind them.