天氣小觀:太平洋高壓熱浪襲捲全台
天氣小觀:太平洋高壓強勁,熱浪襲捲全台
儘管北方西風槽活動,讓太平洋高壓略退,
但是比起原先預期的少,南方熱浪十分強勁,
太平洋高壓的強勢,從西北雨下不來就知道。
就算地面層吹西南風的水汽,在太平洋高壓逆溫層抑制下,
大台北盆地一樣沒戲唱,除了近山區部分地區降與外外,
南部地區雨量也比原先模式預報來的少許多。
太平洋高壓創造的逆溫層,就如同一樣強壁一樣,
從大氣中層下沉增溫,猶如太平洋高壓罩般。
大氣中層 冷
(氣流下沉增溫)
大氣中低層 熱
----------
逆溫層 太平洋高壓罩
----------------
冷
-
地面層 熱 太陽輻射地面散熱
想要突破太平洋高壓罩,通常是強烈的上升氣流伴隨一陣雷聲,
緊接而來的帶來午後雷陣雨消暑。
但這種山區條件比平地好,因為地形爬升,
水汽凝結釋放潛熱,產生強烈上升氣流,打破高壓罩。
山區伴隨著雷聲降雨,登山者往往措手不及。
目前太平洋高壓中心往台灣靠近,壟罩全台,
太平洋高壓罩更加厲害,北方低壓帶/鋒面壓不下來。
事實上,西風槽引導一些涼空氣,但盛夏南方的暖空氣十分強烈,
因此,鋒面結構不完整,變成低壓帶連結的雲系。
模式預報,未來一週,太平洋高壓依舊穩穩壓住西太平洋、台灣到南海。
從氣象上來看,就是源源不絕的好天氣。
不過,會不會太熱情了些。(夏季迷表示...)
(已上供參囉)
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