Be aware that firstly, this is a public suicide and you'll be passing your trauma onto innocent people.
Secondly, there's always crew about who keep an eye out for accidental or deliberate overboard incidents.
Thirdly, it's not that easy to climb up to get over without attracting attention.
Fourthly, in this weather, the crew will be paying extra attention and may well close off access to the decks to prevent any accidents and loss of life.
Fifthly, you'll be risking their lives by forcing them to go out in the lifeboats to look for you, not to mention the lives of the rescue services they call who will spend hours out at sea in this horrific wind and rain searching.
If you want to kill yourself, please find a method that doesn't involve and endanger other people.