Nova Scotia

Nova Scotia is the long peninsula and adjoining Cape Breton Island that fronts the open North Atlantic on its eastern shore and the inner Bay of Fundy on its western. The tide signature varies dramatically across that geography because the Bay of Fundy resonates close to the natural period of the lunar semidiurnal forcing, producing the largest tide range on Earth at its head. Halifax on the Atlantic-facing south shore sits well outside that resonance: mean range at the Halifax harbour gauge is about 1.3 metres, climbing past 1.7 on spring tides. The pattern is cleanly semidiurnal, two highs and two lows about twelve and a half hours apart. Move around to the inner Bay of Fundy at Burntcoat Head, on the Minas Basin side of the peninsula, and the swing grows to roughly 12 metres on a normal day and over 16 metres on the largest spring tides — the world record holder. The Bay of Fundy story is the editorial centrepiece for any Maritime tide page, even one positioned outside the resonant basin like Halifax. The harbour at Halifax itself is the deepest ice-free natural harbour in North America and a working container port; tide changes the day for sea kayakers in the Northwest Arm, fishers off Sambro and Peggy's Cove, and walkers on the McNabs Island shore. The Canadian Hydrographic Service runs the authoritative gauge network and tide tables for the Atlantic provinces. Atlantic-storm surge from nor'easters in winter and post-tropical systems in autumn can lift levels 50 cm or more above predicted; harmonic predictions assume normal weather.