Tropical cyclone Tammy formed over the Atlantic Ocean on October 18th, 2023, and started moving north-west toward the Leeward Islands. The circulation of Tammy appeared elongated in visible satellite images, but the convective activity suggested the formation of a well-defined center. A strong mid-level ridge to the north kept Tammy on a westward track in the early stages, after which a deep layer trough moving across the eastern United States pushed the ridge eastward allowing Tammy to turn toward the northwest.

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