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74个观测站降雨超100毫米

2018-07-17 06:11:03    中国青年网

据初步统计,全市共有密云、怀柔、房山等8个区10个乡镇59个村不同程度受灾。直接受灾人口863人,房屋漏雨平房86间、楼房58栋,其中,东城区累计苫盖漏雨房屋38间。全市共关闭景区121家。

据统计,全市道路塌方11处,包括怀柔G111京加路塌方、密云S310琉辛路塌方等,截至昨晚7时,均正投入抢险人员和抢险设备在全力抢修中。

  解读

  为何暴雨如此凶猛?

为何这一次的暴雨如此“凶猛?”北京市气象局首席预报员张琳娜分析说,有三个成因。

一是水汽充沛,最近本市一直处于副热带高压西北侧的西南气流影响下,15日夜间,西南暖湿气流明显加强,为暴雨提供了充沛的水汽条件。

二是超低空急流和地形的共同作用,导致暴雨落区主要出现在西部和北部山前一带。15日23时以后,边界层的西南气流明显加强为超低空急流。在超低空西南急流和地形的共同作用下,西部和北部山前一带的动力和水汽条件更有利于出现强降水,房山的东南部山前和密云的南部山前一带出现暴雨和大暴雨。

三是强对流导致降水效率高、短时雨强大。近期北京一直处于高温高湿的对流不稳定环境中,这种环境条件特别容易出现以短时强降水为主的强对流天气。“这类天气的特征就是降水效率高、短时雨强大。以最大降水站密云的西白莲峪为例,4个小时降雨量达到了288.7毫米。”张琳娜说。

  提醒

  今日仍有雨 晚高峰恐受影响

昨晚7时40分,北京市气象台升级发布暴雨黄色预警,预计本市降雨将持续到18日早晨,大部分地区雨量可达40—60毫米,局地将超过100毫米;可能出现强降水诱发的中小河流洪水、山洪、地质灾害等次生灾害,低洼地区可能出现积水,请市民防范。与暴雨预警同时生效的还有大风蓝色和地质灾害气象风险橙色预警。

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