请将以下文本总结在3句话以内：ropical storm Allison dumped a massive amount of water on the city of Houston during June 2001. Recorded as the most destructive storm that never achieved hurricane status, it caused more than 52 fatalities and $5 billion in damages. Despite being downgraded, Allison's impact highlights the importance of preparedness for all types of weather events.
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2001年6月，热带风暴艾莉森给休斯顿市带来了巨大水量，成为有记录以来破坏性最强且从未达到飓风级别的风暴。此次风暴导致52人死亡，财产损失超过50亿美元。艾莉森的影响强调了对所有类型气象事件进行防备的重要性。
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