I got my boat through a Cat 4 with storm surge of 13 - 15", by putting 21 lines on it. LOOSE... Some were of BIG stretchy 3 strand to absorb shock, and the 1.5' longer lines, as a final limit, were double braid polyester. Some lines popped, and some melted under "hose" chafe gear
. (The textile kind is better about not causing this).
This was private dockage, (FIXED), and I was staying 300' away at the owners house, who had evacuated. Only by going out into the storm, (gusting to 150 MPH), and going down to adjust lines, was I able to save the boat. First it was up to my waste, then arm pits, then doing the side stroke. (At night of coarse)!
My pilings were WAY out from the boat, which made this much rise possible, along with adjustments, until I couldn't make any more. This is the most important. IF your outer pilings are 25 or 30' out from the boat, it allows for a LOT of rise in the water
level. Of coarse this counts out most marinas
. Otherwise, a REALLY good 3 anchor
temporary mooring, (Fortress 55s), properly done, is your best bet. I set one up during this storm for a friend with a sistership, and it also made it. On our BAD side of the bayou, with over 100 boats, there was 95% loss, as the boats pulled the docks apart, or the improperly anchored ones drug!
For storms... GO EXCESS, and put your heart & soul into it! I know that in MY case, I was less likely to die in the storm, than in the effort to build another boat. As it turned out, I should've stayed on the boat. When the HOUSE was up to my armpits, I had to go out into it one last time, looking for higher ground! VERY sphinctorial indeed!
BTW... Neither the boats on jack stands in the boatyards
, nor the fancy "downtown marinas" with floating concrete docks, made it. They floated up and over the tops of their 13' concrete pilings!