天氣持續不穩定~外出記得帶雨具~102/06/11 - 颱風討論
By Gary
at 2013-06-11T23:10
at 2013-06-11T23:10
Table of Contents
微弱鋒面的影響進入第二天~天氣依然不穩定~
這個鋒面本身其實結構很弱~昨天還有比較明顯的風向不連續面~
今天從測站資料來看~台灣附近的風向蠻混亂的~已經很難抓出明確的地面鋒位置~
北台灣的溫度也比昨天略為回升~溫度的不連續面也變得較為模糊~
不過鋒面的影響性仍在~大氣的不穩定度還是偏高~
中小尺度的對流胞此起彼落~雖然都長不大~但發展經過的時後就會帶來短暫陣雨的現象~
有時候突然間的雨勢還頗大~沒帶雨具的話一定會手忙腳亂~
昨天不太明顯的午後熱對流降雨~今天比較明顯的發生了~
午後的熱力作用在這種微弱鋒面環境中也是很重要的降雨機制之一~
熱對流降雨主要在山區~隨風向擴散到平地後也帶來較大的降雨量~
有一個現象值得持續觀察~
那就是雷達上從昨天到今天白天期間~降雨回波幾乎都是由西南向東北移動~
但是從傍晚開始稍微有了一點改變~那就是東部海面有較強的回波出現~
而且整體發展的趨勢轉變成由東向西~慢慢接近宜花沿海一帶~
這似乎是大氣環境要開始變化的徵兆~
優先要提醒宜蘭花蓮的朋友特別注意這些對流靠近的情況~
今晚到明天有可能造成局部較大雨勢的機會~
西半部陸地上以及海峽上目前也還有許多中小尺度的對流胞在活動~
對流經過的地方就會造成陣雨~也有短時間較大雨勢的可能~
從模式的預估來看~明天端午節(12號)台灣附近的大氣環境會持續變化調整~
首先是南海的擾動低壓預估將要開始發展~
目前的衛星雲圖已經可以隱約看見南海低壓擾動的雛形~
明天起發展的趨勢會較為明顯~環流逐漸建立~範圍也將擴大~
然後就是隨著雅吉颱風北上~太平洋高壓勢力將有西伸加強的現象~
高壓西側邊緣預期明天會慢慢西伸來到台灣以東~
台灣在這兩個因素變化的影響下~環境風向將逐漸轉為東風到東南風~
鋒面位置以及比較明顯的風切輻合線會慢慢往西調整~退回到大陸沿海一帶~
在這個調整的過程中~明天台灣的天氣仍然不穩定~
模式做出來的結果仍有比較明顯的降雨訊號預測~
預估各地仍有短暫陣雨或雷雨發生的機會~
其中東半部因為逐漸轉變成迎風面~可能有較明顯的地形降雨~
還有就是午後熱力作用加入後~仍要留意旺盛對流出現的可能~
提醒大家明天端午節要外出的話~還是要攜帶雨具~並且多注意雷達的最新變化~
後天週四(13號)風切輻合線仍在大陸沿海~台灣附近以東南風為主~
預估迎風的東半部仍然有地形降雨的機會~
西半部則要比較需要注意午後熱對流發展擴散造成的降雨~
週五之後目前看起來還是維持東南風環境~
南海低壓擾動發展變化的情況將是觀察重點~
幾個模式對於南海低壓的預測有分歧落差~有興趣的朋友可以持續追蹤~
以上先簡單供參考囉~
--
這個鋒面本身其實結構很弱~昨天還有比較明顯的風向不連續面~
今天從測站資料來看~台灣附近的風向蠻混亂的~已經很難抓出明確的地面鋒位置~
北台灣的溫度也比昨天略為回升~溫度的不連續面也變得較為模糊~
不過鋒面的影響性仍在~大氣的不穩定度還是偏高~
中小尺度的對流胞此起彼落~雖然都長不大~但發展經過的時後就會帶來短暫陣雨的現象~
有時候突然間的雨勢還頗大~沒帶雨具的話一定會手忙腳亂~
昨天不太明顯的午後熱對流降雨~今天比較明顯的發生了~
午後的熱力作用在這種微弱鋒面環境中也是很重要的降雨機制之一~
熱對流降雨主要在山區~隨風向擴散到平地後也帶來較大的降雨量~
有一個現象值得持續觀察~
那就是雷達上從昨天到今天白天期間~降雨回波幾乎都是由西南向東北移動~
但是從傍晚開始稍微有了一點改變~那就是東部海面有較強的回波出現~
而且整體發展的趨勢轉變成由東向西~慢慢接近宜花沿海一帶~
這似乎是大氣環境要開始變化的徵兆~
優先要提醒宜蘭花蓮的朋友特別注意這些對流靠近的情況~
今晚到明天有可能造成局部較大雨勢的機會~
西半部陸地上以及海峽上目前也還有許多中小尺度的對流胞在活動~
對流經過的地方就會造成陣雨~也有短時間較大雨勢的可能~
從模式的預估來看~明天端午節(12號)台灣附近的大氣環境會持續變化調整~
首先是南海的擾動低壓預估將要開始發展~
目前的衛星雲圖已經可以隱約看見南海低壓擾動的雛形~
明天起發展的趨勢會較為明顯~環流逐漸建立~範圍也將擴大~
然後就是隨著雅吉颱風北上~太平洋高壓勢力將有西伸加強的現象~
高壓西側邊緣預期明天會慢慢西伸來到台灣以東~
台灣在這兩個因素變化的影響下~環境風向將逐漸轉為東風到東南風~
鋒面位置以及比較明顯的風切輻合線會慢慢往西調整~退回到大陸沿海一帶~
在這個調整的過程中~明天台灣的天氣仍然不穩定~
模式做出來的結果仍有比較明顯的降雨訊號預測~
預估各地仍有短暫陣雨或雷雨發生的機會~
其中東半部因為逐漸轉變成迎風面~可能有較明顯的地形降雨~
還有就是午後熱力作用加入後~仍要留意旺盛對流出現的可能~
提醒大家明天端午節要外出的話~還是要攜帶雨具~並且多注意雷達的最新變化~
後天週四(13號)風切輻合線仍在大陸沿海~台灣附近以東南風為主~
預估迎風的東半部仍然有地形降雨的機會~
西半部則要比較需要注意午後熱對流發展擴散造成的降雨~
週五之後目前看起來還是維持東南風環境~
南海低壓擾動發展變化的情況將是觀察重點~
幾個模式對於南海低壓的預測有分歧落差~有興趣的朋友可以持續追蹤~
以上先簡單供參考囉~
--
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颱風
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