Typhoons or hurricanes require many factors for their formation and the South Pacific demonstrates one or more of these qualities. The south pacific provides pre-existing disturbances, warm water, low stability, appropriate Coriolis forces, moist mid level of atmosphere, low vertical wind shear, and a divergence in the upper atmosphere. The south pacific is conveniently located 4 to 5 degrees from the equator and this results in warm water, coriolis factors sufficient to sustain low pressure areas and wind balance, moist air, and low vertical winds which allow for large cloud formation. This is a dangerous mix that almost always produces typhoons during the summer to mid fall season.
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