天氣小觀:未來一周逐漸恢復到夏季風環境 - 颱風討論
By Dora
at 2018-08-09T19:56
at 2018-08-09T19:56
Table of Contents
這幾天出現的東北風環境讓台灣清晨時的溫度都不會這麼炎熱,
以今天清晨六點,北中南溫度都在26~27度,
不過這種東北風很弱,太陽出來一曬,溫度又快速上升,
中南部在背風低壓環境午後熱對流較強。
而台北盆地也靠盆地蓄熱在大屯山群背風側的土城一帶發展一點熱對流。
而未來一周大氣環境重新轉為夏季風盛行的大環境,
模式預報,隨著新誕生的摩羯颱風北上,太平洋高壓開始向西推擠,
使整個季風環流圈往東亞推擠進去,
因此,要留意季風環流圈的南側是否有西南氣流出現。
也由於季風環流圈的關係,大氣環境附近帶有較強的垂直風切,
魔羯颱風在此季風環流圈的環境下,發展阻力不小,
垂直風切是影響颱風結構甚至破壞颱風的重要因子,
強烈的垂直風切表示高低層風向差異很大,且風速不弱的情況下,
低層的輻合不利,高空的輻散不利,
颱風的CISK機制產生一片中心冷雲蓋CCC不規則覆蓋,
使暖心結構發展受阻,負回饋減弱CISK機制,
輕者症狀出現LLCC(低層環流中心)外露,
重者症狀颱風變性或消散。
而魔羯颱風的發展結構不看好也是取決於未來的大環境垂直風切阻力。
不過重點還是留意到魔羯颱風北上後,季風環流圈被推進東亞,
同時新的熱帶低壓或颱風出現,是否接近台灣了,
(以上供參囉)
--
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