如同大多数极端天气状况一样，其剧烈程度是由于几种气象条件反常地汇集在一起造成的。
Like most cases of extreme weather, its severity was due to an unusual confluence of events.
研究天气雷达测定回波顶高的几种误差表明：大气异常折射会引起回波顶高明显误差。
It has been shown by studying the radar echo top heights that the abnormal refraction of the atmosphere can cause obvious errors in the radar measurements of height.
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