变化多端的雨
<p>暴雨：泛指降水强度很大的雨，我国气象部门规定：</p><p><span word="Rainstorm">Rainstorm</span>: <span word="it">it</span> <span word="generally">generally</span> <span word="refers">refers</span> <span word="to">to</span> <span word="the">the</span> <span word="heavy">heavy</span> <span word="rainfall">rainfall</span>. <span word="According">According</span> <span word="to">to</span> <span word="the">the</span> <span word="regulations">regulations</span> <span word="of">of</span> <span word="China">China</span> <span word="Meteorological">Meteorological</span> <span word="Department">Department</span>:</p><p>1、1小时内的雨量为16毫米或以上的雨；</p><p>1. <span word="Rainfall">Rainfall</span> <span word="of">of</span> 16 <span word="mm">mm</span> <span word="or">or</span> <span word="more">more</span> <span word="in">in</span> <span word="one">one</span> <span word="hour">hour</span>;</p><p>2、24小时内的雨量为50毫米或以上的雨。</p><p>2. <span word="Rainfall">Rainfall</span> <span word="within">within</span> 24 <span word="hours">hours</span> <span word="is">is</span> 50 <span word="mm">mm</span> <span word="or">or</span> <span word="more">more</span>.</p><p>暴雨具有“集中性”和“强度大”的特征，出现时雨势倾盆，短时内会造成洼地积水，径流陡增，河水猛涨等现象，是一种严重的灾害性天气。由于我国季风明显，全年雨量多集中在5-9月，因此次期间被定为“汛期”。“汛期”是气象部门预报服务工作中最紧张、最关键的时段。</p><p><span word="The">The</span> <span word="rainstorm">rainstorm</span> <span word="has">has</span> <span word="the">the</span> <span word="characteristics">characteristics</span> <span word="of">of</span> "<span word="concentration">concentration</span>" <span word="and">and</span> "<span word="intensity">intensity</span>". <span word="When">When</span> <span word="it">it</span> <span word="appears">appears</span>, <span word="the">the</span> <span word="rain">rain</span> <span word="will">will</span> <span word="pour">pour</span> <span word="down">down</span>. <span word="In">In</span> <span word="a">a</span> <span word="short">short</span> <span word="time">time</span>, <span word="it">it</span> <span word="will">will</span> <span word="cause">cause</span> <span word="water">water</span> <span word="accumulation">accumulation</span> <span word="in">in</span> <span word="the">the</span> <span word="depression">depression</span>, <span word="the">the</span> <span word="runoff">runoff</span> <span word="will">will</span> <span word="increase">increase</span> <span word="abruptly">abruptly</span>, <span word="and">and</span> <span word="the">the</span> <span word="river">river</span> <span word="water">water</span> <span word="will">will</span> <span word="rise">rise</span> <span word="sharply">sharply</span>. <span word="It">It</span> <span word="is">is</span> <span word="a">a</span> <span word="kind">kind</span> <span word="of">of</span> <span word="severe">severe</span> <span word="disastrous">disastrous</span> <span word="weather">weather</span>. <span word="Because">Because</span> <span word="of">of</span> <span word="the">the</span> <span word="obvious">obvious</span> <span word="monsoon">monsoon</span> <span word="in">in</span> <span word="China">China</span>, <span word="most">most</span> <span word="of">of</span> <span word="the">the</span> <span word="annual">annual</span> <span word="rainfall">rainfall</span> <span word="is">is</span> <span word="from">from</span> <span word="May">May</span> <span word="to">to</span> <span word="September">September</span>, <span word="so">so</span> <span word="the">the</span> <span word="next">next</span> <span word="period">period</span> <span word="is">is</span> <span word="defined">defined</span> <span word="as">as</span> "<span word="flood">flood</span> <span word="season">season</span>". "<span word="Flood">Flood</span> <span word="season">season</span>" <span word="is">is</span> <span word="the">the</span> <span word="most">most</span> <span word="tense">tense</span> <span word="and">and</span> <span word="critical">critical</span> <span word="period">period</span> <span word="in">in</span> <span word="the">the</span> <span word="forecast">forecast</span> <span word="service">service</span> <span word="of">of</span> <span word="meteorological">meteorological</span> <span word="department">department</span>.</p><p>在我国暴雨形成的灾害也非常多。如：</p><p><span word="There">There</span> <span word="are">are</span> <span word="many">many</span> <span word="disasters">disasters</span> <span word="caused">caused</span> <span word="by">by</span> <span word="rainstorm">rainstorm</span> <span word="in">in</span> <span word="China">China</span>. <span word="Such">Such</span> <span word="as">as</span>:</p>
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