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北京今晚至23日迎入汛以来最强降雨 局地大暴雨

2017-06-21 09:31:47   新京报

新京报讯(记者邓琦)今日起至24日,京津冀地区自西向东将出现一次强降雨天气过程。此次降雨持续时间长,影响范围广,累计雨量大,伴有强对流天气,是今年入汛以来华北地区最强降雨。其中,最强降雨出现在21日夜间至23日,北京地区局地可达大暴雨。


预计持续到周六,覆盖京津冀,京冀局部降水量可能超历史同期极值

今日夜间至23日将现最强降雨

昨日下午,北京市气象台针对21日至24日强降雨天气过程,组织华北区域专题会商。

目前预计,21日至24日,京津冀地区自西向东将出现一次强降雨天气过程。降雨初期,弱冷空气与暖湿气流交汇明显,大气对流性强,伴有雷电、短时大风和冰雹,短时雨强较大;中后期低涡主体影响,大气整层温度下降,对流减弱,雨势相对平稳。此次降雨特点是持续时间长,影响范围广,累计雨量大,并伴有强对流天气。

其中,最强降雨出现在21日夜间至23日,河北中北部、北京及天津累计降雨量级可达大雨到暴雨,局地大暴雨,短时雨强较大。

明起气温骤降夜间最低气温19℃

北京地区21日午后到夜间,大部分地区有雷阵雨,以小到中雨为主,雨量分布不均,局地短时雨强较大,并伴有短时大风或冰雹。最强降雨时段出现在22日白天到夜间。23日至24日仍有阵雨或雷阵雨天气。大部分地区累计降雨量级可达大雨到暴雨(40~80毫米),西部山前及东北部地区雨量大,局地可达大暴雨(100~150毫米),最大小时雨强30~50毫米。

受降雨影响,22至24日气温下降明显,白天最高气温为23至27℃,夜间最低气温为19至20℃。

气象专家提醒,此次降雨来势凶猛,公众要注意防范强降雨可能诱发的山洪、滑坡、泥石流、中小河流洪水、城乡内涝等灾害。

■释疑

此次暴雨为何“来势汹汹”?

据中国天气网首席气象专家李小泉分析,造成此次暴雨的“元凶”,是从蒙古国东移而来的一个巨大低涡。在低涡天气系统影响下,水汽辐合明显、上升运动强烈,加之低涡移动缓慢,降水持续时间较长,易形成暴雨天气。

低涡是高空中心气压较低的空气涡旋,低涡中有较强的辐合上升气流,可产生云雨天气。当它在低纬度以较强形式出现时,就是人们熟知的台风;而在中高纬度出现时,就是雨雪“制造机”了。

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