HOW CYCLONES START
Falling pressure is due to a widespread "eddy" motion in the atmosphere, which travels across the country either in the form of a true cyclone or a more degenerate form of low pressure area similar to a wave. It is the increasing wind motion, especially if it occurs over water surfaces, which intensifies evaporation and charges the atmosphere with increased moisture. This increase in moisture then may accelerate or increase the further fall in pressure, which was promoted in the first place by the approach of the "eddy" or low pressure area. The original formation of a low or cyclone is supposed to be J brought about by two main processes: (1) A fortuitous strong insolation, over a particular area, relative to its surroundings, causing convestion and subsequent eddy motion and falling pressure about the heated area; (2) wave formation along the boundary between two adjacent air masses, having different temperatures and/or different velocities or direction.
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Bibliographic details
Auckland Star, Volume LXVII, Issue 104, 4 May 1936, Page 16
Word Count
159HOW CYCLONES START Auckland Star, Volume LXVII, Issue 104, 4 May 1936, Page 16
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Acknowledgements
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