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Hugh Pickens writes:

Bruce Parker, the former chief scientist of NOAA’s National Ocean Service and currently a visiting professor at the Stevens Institute of Technology, reports in the Wall Street Journal that there is a natural explanation for how a temporary path across the Red Sea could have been revealed that that doesn't involve biblical miracles. The explanation involves the tide, a natural phenomenon that would have fit nicely into a well-thought-out plan by Moses, because Moses would have been able to predict when it would happen. In the biblical account, the children of Israel were camped on the western shore of the Gulf of Suez when the dust clouds raised by Pharaoh’s chariots were seen in the distance. The Israelites were now trapped between Pharaoh’s army and the Red Sea. The dust clouds, however, were probably an important sign for Moses; they would have let him calculate how soon Pharaoh’s army would arrive at the coast. Moses had lived in the nearby wilderness in his early years, and he knew where caravans crossed the Red Sea at low tide. He knew the night sky and the ancient methods of predicting the tide, based on where the moon was overhead and how full it was. Pharaoh and his advisers, by contrast, lived along the Nile River, which is connected to the almost tideless Mediterranean Sea. They probably had little knowledge of the tides of the Red Sea and how dangerous they could be

Interestingly enough Moses was not the only leader to cross the Gulf of Suez at low tide. In 1798, Napoleon Bonaparte and a small group of soldiers on horseback crossed the Gulf of Suez, the northern end of the Red Sea, roughly where Moses and the Israelites are said to have crossed. On a mile-long expanse of dry sea bottom exposed at low water, the tide suddenly rushed in, almost drowning them. When Napoleon and his forces almost drowned in 1798, the water typically rose 5 or 6 feet at high tide (and up to 9 or 10 feet with the wind blowing in the right direction). But there is evidence that the sea level was higher in Moses’ time. As a result, the Gulf of Suez would have extended farther north and had a larger tidal range. If that was indeed the case, the real story of the Israelites’ crossing wouldn’t have needed much exaggeration to include walls of water crashing down on the pursuing Egyptians.