大雨還要持續2~3天~2015/08/30 - 颱風討論
By Ingrid
at 2015-08-30T19:00
at 2015-08-30T19:00
Table of Contents
周末這兩天台灣位於強西南風的水氣輸送帶之下,水氣相當充沛,
從850百帕的相當位溫圖上明顯可見往台灣延伸的濕舌,
高值超過345K以上(相當位溫越高表示空氣含水量越大),
而且跟風切輻合線配合的很好,動力條件佳,
對流雲團就陸續在強風軸上發展出來,帶給台灣一陣一陣的降雨,
華南內陸往東北東延伸到台灣北部海面還有較為明顯的相當位溫梯度,
雖然沒有什麼冷空氣,但氣象局可能還是藉由相當位溫梯度畫出了滯留鋒面,
主要象徵的是乾濕氣團的分界而不是冷暖氣團的分界,這一點跟梅雨鋒十分類似。
由於太平洋高壓勢力在未來2~3天內還是偏弱,
因此這條西南風強風軸、水氣輸送帶的位置以及風切輻合線還是會停留在台灣附近,
乾溼分界的滯留鋒面也持續停留,
高層的型態仍是西風槽跟太平洋高壓邊緣在台灣附近對峙,
因此明後兩天( 31日~9月1日)台灣還是很容易下雨的天氣型態,
大家可能還是要持續留意較大雨勢發生的狀況。
簡單供參考囉~
--
從850百帕的相當位溫圖上明顯可見往台灣延伸的濕舌,
高值超過345K以上(相當位溫越高表示空氣含水量越大),
而且跟風切輻合線配合的很好,動力條件佳,
對流雲團就陸續在強風軸上發展出來,帶給台灣一陣一陣的降雨,
華南內陸往東北東延伸到台灣北部海面還有較為明顯的相當位溫梯度,
雖然沒有什麼冷空氣,但氣象局可能還是藉由相當位溫梯度畫出了滯留鋒面,
主要象徵的是乾濕氣團的分界而不是冷暖氣團的分界,這一點跟梅雨鋒十分類似。
由於太平洋高壓勢力在未來2~3天內還是偏弱,
因此這條西南風強風軸、水氣輸送帶的位置以及風切輻合線還是會停留在台灣附近,
乾溼分界的滯留鋒面也持續停留,
高層的型態仍是西風槽跟太平洋高壓邊緣在台灣附近對峙,
因此明後兩天( 31日~9月1日)台灣還是很容易下雨的天氣型態,
大家可能還是要持續留意較大雨勢發生的狀況。
簡單供參考囉~
--
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