Weather balloons measuring upper air temperatures and winds are routinely launched from four stations around New Zealand. The four New Zealand upper air observatories at Raoul Island, Whenuapai, Paraparaumu and Invercargill are run by contractors for MetService and provide data used by forecasters in New Zealand and also shared with the world, via the Global Telecommunications System (GTS). Balloons are launched twice a day at Whenuapai, Paraparaumu and Invercargill ballons at 1100 and 2300 NZT. At Raoul Island balloons are launched once a day at 1100 NZT.
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