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京城提前12天入夏35℃ 周四或现今年首个高温日

2017-05-16 04:45:25   

和大伙儿最近的感受十分贴合,北京果然提前入夏了。今年北京的入夏时间为5月7日,比常年的5月19日提前了12天。本周即将来袭的高温天气,将会让大家感受到“夏姑娘”的十足热情。

不少游客身着夏装在景山公园留下美丽的身影。北京晨报记者 王巍/摄

夏姑娘早到12天

昨天,北京市气象台宣布,2017年京城入夏时间为5月7日,常年(1981—2010年平均)京城的入夏时间为5月19日,2016年入夏时间为5月16日。也就是说,今年夏姑娘提前12天领到了“入境证书”,可谓十分心急。

市气象台专家介绍,当滑动平均气温序列连续5天大于或等于22℃,以其所对应的当年气温序列中第一个大于或等于22℃的日期作为夏季起始日,如果初次判断的起始日期比常年偏早15天以上,需进行起始日的二次判断。

监测数据显示,南郊观象台自5月10日起滑动平均气温序列开始大于22℃,于14日已达到连续5天大于或等于22℃,其所对应的气温序列中第一个大于或等于22℃的日期为5月7日(23℃),而常年入夏日为5月19日,所以无需进行二次判断,可确定2017年北京入夏日期为5月7日。听上去非常复杂是不是?其实市民朋友知道我们已经在一周多前入夏就行了。

今年北京是在3月26日入春的,这么一算,今年春天仅仅维持了不到一个半月——“春脖子”名不虚传。

本周开启高温模式

本周开启高温干热模式,夏姑娘抖擞精神散发热情。今天最高温32℃,感觉尚可,午后阵风较大;从周三到周六,气温持续偏高,最高温将攀至33℃-35℃。其中,周三和周五34℃,周四35℃,周六33℃。如果周四成功攀上35℃,意味着今年的首个高温日出现了。去年夏天的头两个高温日出现在6月,分别是2016年6月16日和19日。今年如果首个高温日出现在5月18日,那就比去年早了约一个月。

从未来一段时间天气预报看,从周日开始,最高温缓慢下降,跌至32℃。下周初,最高温继续下降到30℃以下,高温天气将不会一直延续。

近期没有有效降雨

对于市民渴望的降雨,市气象台专家表示,近期京城没有有效降雨。春季已逝,夏天已至,今年春天几乎没有一场像样的春雨,等到汛期来临后才会有望出现较成规模的降水。近期京城干热、暴晒、高温,非常天干物燥,气象专家提醒市民,多注意补水保湿,外出一定要做好防晒措施。北京晨报记者 王海亮

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