Climate Central: A swirl of thunderstorms in the Caribbean, which is a notorious breeding ground for October hurricanes, is expected to coalesce into Tropical Storm Sandy and possibly intensify to hurricane strength as it moves toward Jamaica, eastern Cuba, and the Bahamas by Wednesday and Thursday. But it’s what could happen after that that has some weather forecasters pondering some rather bizarre scenarios — think if a hurricane and nor’easter mated, possibly spawning a very rare and powerful hybrid storm, slamming…

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