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Two tropical systems near the Carolinas could interact in a rare “dance” that might steer dangerous storm away from the coast.

The phenomenon, called the Fujiwhara Effect, occurs when storms get within 800-900 miles of each other and begin orbiting around a central point.

If Hurricane Humberto fails to pull the developing storm eastward, the Carolinas could face significant flooding from heavy rains early next week.

NEW YORK — As a wet tropical system chugged north toward the Bahamas on Saturday, its threat to the Carolina coast might be determined by its unusual interaction — maybe even a rare dance — with another tropical system that could steer the mess out to sea.

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