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北方7地将迎今年首个高温日 局地气温或破37℃

2017-05-18 04:03:41   新京报

新京报讯昨日北京冲击今年首个高温日(最高气温大于或等于35)“失利”,最高气温止步32。今日北京最高气温将再次冲击35,这或将成为今年首个高温日。预报称今明两天北京将继续晴热高温模式,预计白天最高气温在35至36之间。

昨日,几名游客顶着烈日游览天安门广场。图/视觉中国

夜间和早晚仍比较凉爽

昨日上午9时20分,代表“北京温度”的南郊观象台气温达到25.3;11时20分,观象台气温为27.8。虽升温势头强劲,但昨日最高气温并未达到35,最终定格在32。

根据北京市气象台16日下午发布的高温黄色预警信号,从17日至20日,北京地区将出现晴热高温天气,预计平原地区日最高气温可达34至36,其中17日至19日最高气温在35以上,部分地区可达37左右。

专家表示,由于这个季节空气湿度小,昼夜温差大,夜间和早晚仍然比较凉爽。周六白天,北京气温将有所回落,但最高气温仍有34左右,建议公众及时关注天气变化。

此次高温覆盖7省区市

不止是北京,17日至19日,北方多地将遭遇高温“烤”验,影响范围涉及7个省(区、市)。在此次高温天气过程中,18日的高温天气影响范围最广,强度最大。中央气象台已于17日18时发布高温黄色预警。

中央气象台首席预报员方翀表示,这是今年以来影响华北地区的首次大范围高温天气过程。

方翀介绍,此次高温天气过程影响范围较广,内蒙古东部偏南地区、辽宁西部、河北中南部地区、山西部分地区、北京、天津、河南北部、山东北部等地都会出现高温天气。强度较大也是此次高温天气的特点之一,受影响的大部分地区17日至19日的最高气温会达到35以上。方翀说,18日内蒙古东部偏南地区最高气温可能达到38以上。19日,华北地区东部局地也会出现37以上高温。

从19日夜间开始,在弱冷空气的影响下,此轮高温天气将有所缓解。从往年数据来看,近期华北地区气温虽然较历史同期明显偏高,但并未突破历史极值。

华北多地入夏明显偏早

早在此次高温天气之前,华北多地就已悄悄入夏,比往年明显偏早。

今年北京入夏时间是5月7日,比常年入夏日(5月19日)提前了12天;从5月10日开始,天津市区日平均气温连续5天高于22,也已达到入夏标准,与该市平均入夏时间(5月14日)相比,今年入夏时间偏早4天;与天津同一天步入夏天的还有石家庄市,河北省气象服务中心资料显示,与石家庄平均入夏时间(5月21日)相比,今年该市入夏明显偏早。

据气象部门介绍,代表“北京温度”的观象台历史上(即有气象资料以来,1951-2016),5月中旬有6年出现过35以上高温;有两年(1968年、2001年)出现过37以上高温;极端最高气温为38.3,出现在1968年5月14日。

也就是说,近几日的高温天气,与历史极值相比仍有距离。

责任编辑:穆启春 CN063
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