The Caribbean is choked with Sargasso weed. Don't go there! This is why, the equatorial currents from Africa are weak for some reason, leading to a big Sargasso playground off Brazil, fed by Amazon farming.
I haven't been looking long, but I think this is unusual. A strong current would just sweep through. Could lead to colder temperatures, but for El Nino. I think we'll have a ton of snow.
Add: a new map shows El Nino backing off again. But the Atlantic backwash is getting stronger. Obviously they are related, perhaps due to wind reversal.