天氣概況~2012/07/23 - 颱風討論
By Regina
at 2012-07-23T09:37
at 2012-07-23T09:37
Table of Contents
昨天趁著台北天氣不錯~跟朋友上陽明山面天山頂拍照~
發現雖然颱風已經離台灣有一段距離~但是山頂的東風仍然非常強勁~
季風槽延伸到台灣附近的情況相當明顯~
並且跟太平洋高壓之間形成氣壓梯度~造成氣流速度較快的現象~
強勁的風勢讓天空的中高層雲不斷展現絢麗的變化~
較低的位置則不停的有碎積雲飄過~在山頂有種天空之城的感覺~
這股氣流也不斷帶來水氣~使得迎風面昨天持續有地形降雨~雨勢還不小~
西半部則有午後熱對流爆發~局部地區又出現大雷雨的現象~
入夜後東南方進來的降雨系統延伸到北台灣~早上天氣不錯的北部東北部也開始下雨~
昨晚8點左右從山頂要下來的時候已經是跟降雨雲層賽跑的狀態..XD
過去的周末這兩天雖然颱風沒有直接的影響~但是間接的影響也不小~
前幾天的發文中已經有提醒大家要多注意~希望有幫上大家的忙~
因為季風槽的延伸擴展~韋森特的移動也跟著出現變化~
高壓脊的位置往北抬~變得比較遠離颱風~引導力減弱~
韋森特陷入大範圍的季風低壓區內~猶如龍困淺灘~
因此速度突然變慢下來~過去一段時間明顯在香港以南呈現打轉~
不過也因為停留打轉的關係~強度有了持續發展的空間~
看起來颱風環流變得更大了~不斷吸收南海溫暖海水的能量~威力持續加強~
原本來不是很理想的結構目前已經變的蠻漂亮的~
螺旋型態組織漸趨明顯~不再是一大團只會佔空間的龐大對流~
目前韋森特已經快要打轉了一圈~從原本往南現在往北~
範圍變大後逐漸會跟北抬的高壓脊重新接觸~
未來仍將轉回西北到西北西方向移動~大致仍是會朝向粵西或雷州半島一帶靠近~
從結構的短時間變化來看~目前強對流較偏在環流東半圈~有逐漸往中心北側伸展的現象~
強對流偏在中心東側時有利颱風偏北漂移~等延伸到中心以北時就會變成往西偏~
因此預估今天白天偏西的分量會增加~使方向轉回西北到西北西移動~
由於威力加強的關係~未來兩天可能給港澳以及粵西~海南島~廣西沿海帶來頗大的衝擊~
天氣會變的惡劣~風大雨大~計畫要前往這些地方的朋友務必要多加注意~
粵東沿海~福建沿海以及台灣一帶則持續位於季風槽北側~
較強的偏南到東南風氣流還會維持下去~水氣多~同樣容易降雨~
預估今天在東半部以及恆春半島仍有迎風面的地形降雨~並且有局部較大雨勢出現的機會~
西半部要注意午後熱對流發展擴散的情況~仍有大雷雨發生的可能~
天氣情況並不穩定~計畫要外出的朋友最好能攜帶雨具~
並且要隨時注意雷達圖的最新變化~
明後兩天(24~25號)預估仍是這種水氣較多~吹東南風為主的天氣型態~
迎風的東半部以及恆春半島持續有地形降雨機會~
西半部午後有熱對流發展擴散的現象~要留意較大雨勢發生的情況~
由於季風槽內不排除還有其他擾動發展靠近~
因此兩三天後的情況可能變數還蠻大的~特別是要注意台灣東南方~季風槽東端處的演變~
氣流轉彎點在這邊~有正渦度的氣旋曲率~跑出新的小擾動是有可能的~
而且可能一但出現應該很快就會靠近台灣而來~
有興趣的朋友不妨多觀察這一兩天季風槽東端的變化情況~
另外就是關島以南低緯度處海域還有其他的低壓區活動~
這是南半球越赤道氣流跟高壓東風輻合的產物~
同樣可以注意這邊是不是會有動靜出現~
7月下旬如同早先所預期的~西北太平洋又恢復活力~開始醞釀許多擾動~
未來一段時間的觀察重點都要放在擾動的發展上了~
以上簡單供參考囉~
--
發現雖然颱風已經離台灣有一段距離~但是山頂的東風仍然非常強勁~
季風槽延伸到台灣附近的情況相當明顯~
並且跟太平洋高壓之間形成氣壓梯度~造成氣流速度較快的現象~
強勁的風勢讓天空的中高層雲不斷展現絢麗的變化~
較低的位置則不停的有碎積雲飄過~在山頂有種天空之城的感覺~
這股氣流也不斷帶來水氣~使得迎風面昨天持續有地形降雨~雨勢還不小~
西半部則有午後熱對流爆發~局部地區又出現大雷雨的現象~
入夜後東南方進來的降雨系統延伸到北台灣~早上天氣不錯的北部東北部也開始下雨~
昨晚8點左右從山頂要下來的時候已經是跟降雨雲層賽跑的狀態..XD
過去的周末這兩天雖然颱風沒有直接的影響~但是間接的影響也不小~
前幾天的發文中已經有提醒大家要多注意~希望有幫上大家的忙~
因為季風槽的延伸擴展~韋森特的移動也跟著出現變化~
高壓脊的位置往北抬~變得比較遠離颱風~引導力減弱~
韋森特陷入大範圍的季風低壓區內~猶如龍困淺灘~
因此速度突然變慢下來~過去一段時間明顯在香港以南呈現打轉~
不過也因為停留打轉的關係~強度有了持續發展的空間~
看起來颱風環流變得更大了~不斷吸收南海溫暖海水的能量~威力持續加強~
原本來不是很理想的結構目前已經變的蠻漂亮的~
螺旋型態組織漸趨明顯~不再是一大團只會佔空間的龐大對流~
目前韋森特已經快要打轉了一圈~從原本往南現在往北~
範圍變大後逐漸會跟北抬的高壓脊重新接觸~
未來仍將轉回西北到西北西方向移動~大致仍是會朝向粵西或雷州半島一帶靠近~
從結構的短時間變化來看~目前強對流較偏在環流東半圈~有逐漸往中心北側伸展的現象~
強對流偏在中心東側時有利颱風偏北漂移~等延伸到中心以北時就會變成往西偏~
因此預估今天白天偏西的分量會增加~使方向轉回西北到西北西移動~
由於威力加強的關係~未來兩天可能給港澳以及粵西~海南島~廣西沿海帶來頗大的衝擊~
天氣會變的惡劣~風大雨大~計畫要前往這些地方的朋友務必要多加注意~
粵東沿海~福建沿海以及台灣一帶則持續位於季風槽北側~
較強的偏南到東南風氣流還會維持下去~水氣多~同樣容易降雨~
預估今天在東半部以及恆春半島仍有迎風面的地形降雨~並且有局部較大雨勢出現的機會~
西半部要注意午後熱對流發展擴散的情況~仍有大雷雨發生的可能~
天氣情況並不穩定~計畫要外出的朋友最好能攜帶雨具~
並且要隨時注意雷達圖的最新變化~
明後兩天(24~25號)預估仍是這種水氣較多~吹東南風為主的天氣型態~
迎風的東半部以及恆春半島持續有地形降雨機會~
西半部午後有熱對流發展擴散的現象~要留意較大雨勢發生的情況~
由於季風槽內不排除還有其他擾動發展靠近~
因此兩三天後的情況可能變數還蠻大的~特別是要注意台灣東南方~季風槽東端處的演變~
氣流轉彎點在這邊~有正渦度的氣旋曲率~跑出新的小擾動是有可能的~
而且可能一但出現應該很快就會靠近台灣而來~
有興趣的朋友不妨多觀察這一兩天季風槽東端的變化情況~
另外就是關島以南低緯度處海域還有其他的低壓區活動~
這是南半球越赤道氣流跟高壓東風輻合的產物~
同樣可以注意這邊是不是會有動靜出現~
7月下旬如同早先所預期的~西北太平洋又恢復活力~開始醞釀許多擾動~
未來一段時間的觀察重點都要放在擾動的發展上了~
以上簡單供參考囉~
--
Tags:
颱風
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