“七下八上”期间降雨有何特点?如何防范?分析解读↓|免费看污又色又爽又黄又脏小说
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央视网消息:本轮多地的降雨天气正值我国“七下八上”防汛关键期,这也是每年防汛形势最为复杂严峻的时期。“七下八上”期间的降雨有何特点?应该如何防范?
“七下八上”降雨主要形态:“锋面暴雨”和“暖区暴雨”
中央气象台首席预报员徐珺介绍,“七下八上”的降雨,主要可呈现两种不同的形态。夏季风为北方地区带来充沛的水汽,当伴随大范围明显冷空气作用时,冷暖对峙较为激烈。这些水汽将以大范围降雨的形式被消耗,通常称为“锋面暴雨”。这张卫星云图,正在影响东北地区的就是一个大范围锋面云系。对峙的强度越为激烈,降雨的强度也倾向于越大,具有范围广、强度大的特点。
当冷空气势力较弱或距离较远时,冷暖对峙较弱,夏季风输送来的大量的水汽就在北方部分地区不断堆积,形成高温、高湿,让我们感到闷热不适的环境,小范围的强对流一触即发。通常扣动这些对流的“扳机”,包括地形对暖湿气流的抬升、海陆风、低空急流等,这种对流又称为“暖区对流”。分散的暖区对流并不能造成区域性的强降雨。
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