It represents the combination of storm conditions (wave height and wind speed) which on average should occur only once every 100 years.

该标准代表风暴条件(波高和风速)的联合作用，这种情况平均每一百年仅出现一次。

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Although meteorologists know what conditions favour their formation, they are hard-pressed to say exactly where a storm will occur until it is almost too late.

尽管气象学者们清楚地知道有利于雷暴形成的条件，但是要及时而又精确地预测雷暴发生的地点使他们感到压力重重。

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Set in the low-lying Ganges–Brahmaputra River Delta, Bangladesh sits in a perfect storm of climactic conditions.

处在低洼的恒河—雅鲁藏布江三角洲地区，孟加拉国坐落在具有形成完美风暴的条件下。

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The warning means tropical storm conditions, including sustained winds of at least 39 mph, were expected in the next 24 hours.

CNN: Katrina hits Florida: 3 dead; 1 million in dark

Storm conditions were possible in those areas within 48 hours.

CNN: Tropical Storm Emily forms in the Caribbean

Tropical storm warnings were in effect for Dominica, Puerto Rico, the Dominican Republic and the islands of Guadeloupe, Desirade, Les Saintes and Marie Galante, meaning that tropical storm conditions were expected within 36 hours.

CNN: Tropical Storm Emily forms in the Caribbean