低壓帶籠罩~注意強降雨~102/08/14 - 颱風討論
By Leila
at 2013-08-14T22:37
at 2013-08-14T22:37
Table of Contents
隨著高壓北抬~南邊的熱帶輻合區(ITCZ)低壓帶跟著尤特颱風北上~
今天台灣已經陷入這個大氣狀況不穩定的帶狀區域中~水氣明顯增多~
除了偏南及西南風的迎風面降雨以外~中北部地區如昨天預期的出現午後大雷雨狀況~
午後熱對流的降雨比迎風面降雨還要更為明顯劇烈~
完全反應了不穩定大氣加上豐沛水氣以及熱力作用的三重奏效果~
目前來看ITCZ可能還要停留一段時間~
北邊的太平洋高壓脊預估會一直停留在較偏北的位置~
因此從中南半島北部~華南~台灣到日本南方海面就會是夾在副高跟赤道反氣旋間的區域~
如果這樣的配置不改變~不穩定的天氣就會持續下去~
目前熱對流殘餘的雲層仍然在影響中北部地區~有些地方仍在降雨~
不過這些熱對流殘餘的降雨會漸趨緩和~
南部~恆春半島以及東南部地區的朋友今晚則要持續留意海面上移入的降雨系統影響~
明天周四到後天周五(15~16號)台灣附近大致仍是以偏南風到西南風為主~
除了迎風面地區包括南部~恆春半島以及花東地區的迎風降雨以外~
中部北部到東北部地區午後仍然會有大雷雨出現的機會~
這兩部分的降雨雖然原因不同~但是都可能會有較大雨勢發生~
因此全台灣的天氣可以說都是相當不穩定的狀態~請大家要特別注意~
比較好的一點是溫度隨著降雨增多而下降~不再那麼的炎熱了~
周末(17~18號)要開始注意台灣以東~季風槽東端的熱帶擾動發展狀況~
目前已經有兩個擾動存在~包括台灣東南的98W以及較遠處的99W~
兩個擾動之間勢必要彼此整合~因此哪一個擾動會發展變數還很大~
而且現在這兩個擾動都還沒有明顯的旋轉性~在大低壓帶中發展通常都會很慢~
短時間內只要持續觀察就可以~還不必太緊張~
等到擾動整合出較明確的環流並且開始發展後~對台灣的影響程度才會比較明朗~
發展位置距離台灣較近的話~影響就大~距離台灣較遠則影響就會比較小~
而且擾動在台灣以東發展也會有把西南風水氣輸送給吸走的效果~
反而會讓往台灣上空傳送的水氣出現較為減少的情況~
迎風降雨減緩~午後雷雨的發展也會相對緩和~
再來就看擾動的移動了~如果發展增強又是往台灣過來的話~情況就會嚴重許多~
目前幾個模式之間的預測分歧頗大~因此都還需要觀察~
周末以後到下周初的天氣較難預測~預報結果隨時可能會改變~
打算安排活動的朋友請隨時注意最新的天氣訊息~
以上先簡單供參考囉~
--
今天台灣已經陷入這個大氣狀況不穩定的帶狀區域中~水氣明顯增多~
除了偏南及西南風的迎風面降雨以外~中北部地區如昨天預期的出現午後大雷雨狀況~
午後熱對流的降雨比迎風面降雨還要更為明顯劇烈~
完全反應了不穩定大氣加上豐沛水氣以及熱力作用的三重奏效果~
目前來看ITCZ可能還要停留一段時間~
北邊的太平洋高壓脊預估會一直停留在較偏北的位置~
因此從中南半島北部~華南~台灣到日本南方海面就會是夾在副高跟赤道反氣旋間的區域~
如果這樣的配置不改變~不穩定的天氣就會持續下去~
目前熱對流殘餘的雲層仍然在影響中北部地區~有些地方仍在降雨~
不過這些熱對流殘餘的降雨會漸趨緩和~
南部~恆春半島以及東南部地區的朋友今晚則要持續留意海面上移入的降雨系統影響~
明天周四到後天周五(15~16號)台灣附近大致仍是以偏南風到西南風為主~
除了迎風面地區包括南部~恆春半島以及花東地區的迎風降雨以外~
中部北部到東北部地區午後仍然會有大雷雨出現的機會~
這兩部分的降雨雖然原因不同~但是都可能會有較大雨勢發生~
因此全台灣的天氣可以說都是相當不穩定的狀態~請大家要特別注意~
比較好的一點是溫度隨著降雨增多而下降~不再那麼的炎熱了~
周末(17~18號)要開始注意台灣以東~季風槽東端的熱帶擾動發展狀況~
目前已經有兩個擾動存在~包括台灣東南的98W以及較遠處的99W~
兩個擾動之間勢必要彼此整合~因此哪一個擾動會發展變數還很大~
而且現在這兩個擾動都還沒有明顯的旋轉性~在大低壓帶中發展通常都會很慢~
短時間內只要持續觀察就可以~還不必太緊張~
等到擾動整合出較明確的環流並且開始發展後~對台灣的影響程度才會比較明朗~
發展位置距離台灣較近的話~影響就大~距離台灣較遠則影響就會比較小~
而且擾動在台灣以東發展也會有把西南風水氣輸送給吸走的效果~
反而會讓往台灣上空傳送的水氣出現較為減少的情況~
迎風降雨減緩~午後雷雨的發展也會相對緩和~
再來就看擾動的移動了~如果發展增強又是往台灣過來的話~情況就會嚴重許多~
目前幾個模式之間的預測分歧頗大~因此都還需要觀察~
周末以後到下周初的天氣較難預測~預報結果隨時可能會改變~
打算安排活動的朋友請隨時注意最新的天氣訊息~
以上先簡單供參考囉~
--
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颱風
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