We were at CTI last November and I believe there were red flags out twice, but not for the whole day. There were some disappointed people because they won't ferry anyone out to the island if the flags are red.
matt & Lisa...at any beach, there is usually a flag system used to let people know about the condition/safety of the water. Green = no issues, Yellow = Use Caution, and Red = Dangerous conditions. Water Sport activities will be cancelled if conditions warrant a red flag.
They mean the red flags to let you know there are no water sports allowed during that time the red flag is waving... like if the ocean is just too choppy, it's too windy, etc... We have went in November and December and it's hit or miss just as in any other time of year. Personally we've experienced near perfect weather our last two trips on the Ocho Rios side... other than a rain shower that lasts about 20 minutes two afternoons, which was hardly noticeable.