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六年来最大的冷涡暴雨即将光临京津冀!

2017-06-20 16:45:25   

最近一段时间,北方热旱当道,高温盛行。由于副热带高压长期“瘫痪”在太平洋深处,水汽全部堆在南方上不来,6月上旬冷涡来了之后仍然“巧妇难为无米之炊”,在6月18号之前连一场像样的雷雨都造不出,华北、东北旱情急剧发展。

国家气候中心干旱监测图,颜色越深代表旱情越严重

包括北京泥石流、辽宁和唐山冰雹在内的一系列强烈天气事件,无疑是冷涡进击、天气大变化的严厉警告:这是副热带高压和水汽北抬的开始,但远远不是冷涡雷雨的结束。从6月21号开始,一个蒙古冷涡将直接南下经过北京,与此同时在副热带高压支持下,西南季风、东南季风同时进入华北平原,更为强大的冷涡雷雨正在酝酿。

6月21-24日,冷涡进入北京形势图

除了“七下八上”(七月下旬到八月上旬)的暴雨集中时段外,北京还有一个不为人知的冷涡暴雨期,时间是6月上旬到7月上旬。这个时段的暴雨,范围、总雨量和持续时间一般不如“七下八上”,但因为有冷涡的高空冷空气捣乱,往往伴有强烈的雷电、狂风,甚至冰雹,就像这两天河北、辽宁一样。一句话,冷涡雷雨一般都下的很急,气势吓人。

河北唐山的降雨回波。可见对流非常强烈,已突破雷达反射率因子色阶上限

冷涡雷雨是非常急的。它不会像北京台预报的那样,给你匀成两天大雨慢悠悠地下,而很大可能是一阵一阵凶猛的短时暴雨,并伴有强烈雷电、大风,甚至冰雹。虽然总雨量比不上去年的720暴雨,但有冷涡在,雨势的急骤程度要超过。我们还请北京、天津、河北的朋友,从6月21日开始就不要爬山,不要登长城,不要露营,出门之前都要及时关注天气情况,倍加小心。

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