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本周晴歌高唱 偶尔插播阵雨

2017-08-07 05:01:14   中国青年网

■本报记者 赵金玲

通讯员 唐晓珊 李长伦 实习生 张晗

时间过得真快,不知不觉,今日就立秋了!听到“秋”字,是不是天气开始凉爽了?没那么快!现在还处在三伏天,就广西而言,暑气未消,闷热依旧,阵雨雷雨说来就来,且南宁气温还要攀升到36℃。从节气来讲,广西入秋要等到寒露后霜降前,这段时间才是广西的秋天。

立秋虽到 全区暑气未消

今日15时40分“立秋”,这是秋天的第一个节气。在我国大部分地区,立秋并不意味着秋天的到来。天文专家解释说,因为“双中伏”的缘故,今年的立秋刚好在中伏和末伏之间。

气象资料显示,立秋期间,广西各地的平均气温仍有27~29℃,比秋季国标(22℃以下)还高5~7℃。按正常年份,广西各地的平均入秋时间:桂北在10月上旬;桂南则需要等到10月中旬。从节气来讲,广西入秋要等到寒露后霜降前。

立秋节气,广西有两大天气特点。其一,立秋虽到,暑气未消,闷热依旧。立秋前,影响我国主要的天气系统——副热带高压(以下简称“副高”)主要控制江南以北到华北一带地区。

立秋后,副高开始季节性东退南落,重新回到华南地区,并在这一带摆动。受其影响,广西晴热天气较多,所以暑期难消,高温依旧。

其二,阵雨、雷雨说来就来。据气候资料统计分析,8月是广西降雨高峰月之一。其主要原因是受副高边缘潮湿且不稳定的上升气流影响,午后易产生阵雨或雷雨并伴有短时大风天气。另外,8月还是台风影响的高发期,台风带来的大风暴雨等天气会引发洪涝及地质等次生灾害,是防汛抗台工作的关键时期。

立秋不“秋” 南宁高温依旧

受副高边缘影响,昨日午后,桂西一带有洒雨降温,而桂东几乎没有雨水干扰,15时大部气温抬升直逼35℃。

未来一周,广西天气如何?记者从广西气象台了解到,未来一周(7—13日),由于热带辐合带已经消失,在西太平洋或南海生成台风的可能性不大。周前期受副高影响;周中期(9—10日)有一次高空槽东移影响过程;周后期处在副高边缘。

预计,今日副高覆盖广西上空,全区唱晴歌,一波较大范围的高温将在桂北和桂中铺开,局地飚至37℃以上。明日,北方来的冷空气到达桂北,副高撤退。冷空气和暖湿气流这对冤家又要干架了,8日桂北多阵雨或雷雨,高温范围缩减,9日—11日桂北和桂中有中到大雨,局部暴雨。

本周全区各地的平均气温在27.5~30.5℃之间。与历年同期相比,气温正常;降雨量沿海偏少四至六成,桂东北偏多五至八成,其余地区正常。

广西气象台预计,昨晚到今日,防城港、钦州、北海、玉林等市多云有分散阵雨或雷雨;今日,桂北、桂中大部最高气温35~36℃,局部37℃以上。其中,南宁市多云,局地有阵雨或雷雨,偏南风1~2级,最低气温26℃,最高气温36℃。

■知多少

“立秋”节气,有两个习俗——“过磅”和“咬秋”。

“过磅”,就是称体重。盛夏炎热,通常没胃口,吃得少,体重会减轻。所以古时候到了立秋,得赶紧称一下,看看自己轻了多少,以后好“贴秋膘”补回来。

“咬秋”,也叫“啃秋”。意思是,夏季酷暑难熬,好不容易立秋了,要把秋天一口咬住,别让它跑了。

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