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东北华北强降雨竟然是台风惹的祸?

2017-08-03 20:31:46   

中国经济网北京8月3日讯 (记者 杜芳) 8月2日,华北东北等地出现强降雨天气,内蒙古东南部、吉林中部、辽宁东部、北京中东部、河北东部、天津北部和南部、山东中西部等地出现暴雨或大暴雨。其中,辽宁全省42个站出现大暴雨,最大降雨出现在朝阳市工业园区为210毫米,最大雨强75毫米;吉林省长岭太平山镇降雨量为178.8毫米;河北承德、唐山、沧州局地降雨量200-270毫米。强降雨给交通出行、公众生活、农业生产和中小河流度汛带来不利影响。 “传说”中这些地方的强降水是受台风影响而至,可是台风“海棠”明明已停编,又如何会将势力范围深入遥远的内陆呢? “虽然台风已经停止了编号,但是有残余云系在北上,在北上过程中与北方的冷空气交汇在华北东部,现在已到了东北地区。正是这次台风残余云系北上和北方冷空气结合相互作用造成了华北东北降水。” 中央气象台首席预报员许映龙说。 这股残余势力还将带来持续影响。专家表示,“海棠”减弱变性后的低压系统继续北上,其北部在遭遇西风带高空槽系统和中高纬冷空气后,在华北东北部逐渐发展出新的温带气旋系统,呈逆时针旋转的气旋以东地区、低纬地区的偏南暖湿季风气流得以继续强势北上,携带大量水汽,在东北地区遭遇中高纬冷空气,形成暖锋。与此同时,气旋以西的偏北风引导中高纬的弱冷空气南下与东部偏南季风擦肩而过,形成山东东部至苏皖江西一带的弱冷锋。强对流云团主要出现在气旋云系气旋中心东北侧的暖锋云带和南部的冷锋云带上,其中暖锋云带上的强对流云团尺度较大,冷锋云带上的强对流云团尺度较小。 因此,东北地区仍有强降雨过程。内蒙古东南部、辽宁西部的强对流云团组织结构较好,有利于形成持续性的降雨。山东东部、内蒙古东南部、东北地区中西部等地有大雨或暴雨,其中,吉林西部、黑龙江南部、辽宁南部等地局部有大暴雨。 专家提醒,此次强降雨天气影响范围较广,部分地区雨势较强,伴随有雷电、大风等强对流天气。目前正值暑期旅游旺季,游客朋友要及时关注最新预报预警信息,合理安排出行时间,并注意交通安全,特别要注意暴雨可能导致的山洪、泥石流、城市内涝等以及中小河流洪水等次生灾害。同时,雷暴大风可能造成棚舍和广告牌等建筑物倒塌,对高空作业、水域作业和航行有不利影响,冰雹可能对农作物和农业设施造成影响,建议相关行业加强防御。


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