Hurricane forecasters are keeping watch on a broad area of low pressure off the East Coast.
Located nearly 500 miles northeast of Bermuda, the system is producing gale-force winds and thunderstorms and moving northeast.
Forecasters said late Monday it has a 60 percent chance of becoming a subtropical or tropical storm in the next 24 to 36 hours.
A tropical storm generally has a center and is powered by warm surface waters. A subtropical storm does not have an eye and is powered by the interaction of cold and warm air. If the system becomes a tropical or subtropical storm, it will be named Chris.
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