Isabel wrecked Colonial Beach, VA on the Potomac, where I keep our boat.
There is a peninsula between the river and Monroe bay where the marina sits.
Many, many boats were hauled, some due to BUS recommendations. Unfortunetly, when the surge came up and over the peninsula, it took every boat with it, along with some old buildings and washed them into the bay and out, to be destroyed.
My brother and I along with a few other boats were spared damage by securing 4 times at each corner and mid cleats to the tall pilings of our slips, up high. Our pilings were tall due to awaiting covers going over in the near future.
The surge came and lifted our boats a good 7' before receeding. The way we secure the boats prevented the boats from ending back on top of the dock when the level went down. I did remove the complete enclosure, electronics, lower antennas and secured everything that could be blown around.
Everyone's slip/tiedown location may be different but be sure to check out the layout of where your boat may be positioned on the hard or in a slip, to wind and possible surge directions. Good luck and talk to you all after the storm!