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In page Cyclone Olaf:

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On February 18, an approaching upper level trough to the south, and strong wind shear caused Olaf to weaken as the storm rapidly moved southeastward. As Olaf moved into the New Zealand area of responsibility, the main circulation separated from the center and Olaf quickly became extratropical 18 hours later. The extratropical remnants of Olaf, quickly re-intensified into a powerful extratropical storm on February 23. The extratropical storm persisted for two days before dissipating near Pitcairn Island [2]