Causal Analysis of Strong Wind Weather in Zhejiang Induced by Typhoon Morakot
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Abstract:
An analysis is made of the causes of strong wind weather in Zhejiang during the typhoon Morakot by using the conventional radiosonde, automatic station, NCEP/NCAR 1°×1° reanalysis, and Doppler radar data. Results show that strong winds had the characteristics of early influence, long duration, wide scope, and strong intensity. The strengthened and westward moved subtropical high is the main cause that made the strong wind appear earlier. The typhoon moved slowly, which was caused by the saddle field and the interaction of three typhoons, leading to the persisting strong wind. The maintenance of pressure gradient is the cause of earlier and wider strong wind influence. The analysis indicates that the downward transport of high level momentum and the downward moving wind speed center enhanced the surface winds. The velocity products of Doppler radar can also be used as important references for forecasting extreme wind speeds in typhoons.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.