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Commonwealth Bay is an open bay about 48 km (30 mi) wide at the entrance between Point Alden and Cape Gray in Antarctica. It was discovered in 1912 by the Australasian Antarctic Expedition under Douglas Mawson, who established the main base of the expedition at Cape Denison at the head of the bay. Named by Australasian Antarctic Expedition after the Commonwealth of Australia.
It is listed in both the Guinness Book of World Records and the Eighth Edition of the National Geographic Atlas as the windiest place on Earth with winds regularly exceeding 240 kilometres (150 mi) per hour and an average annual wind speed of 80 kilometres (50 mi) per hour.
Storms are caused by katabatic wind, a concentrated flow of cold air moving along the steep surface of the ice shield towards the sea. The air flow is accelerated by the increasing gradient of the surface of ice and the cliff monolith at Cape Denison. In the summer there are periods of relative calm but during winter storms are especially strong and long lasting, and can start and end unexpectedly. An abrupt start and end of storm might be accompanied by powerful whirlpools and expressive short-lived and fast-moving clouds at the coast line.
- Katabatic winds at Commonwealth Bay, Wondermondo, 27 September 2010
- Ball, F.K. (1956), The Katabatic Winds of Adelie Land and King George V Land.
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