Re: 明天鋒面掠過,注意較大雨勢~2014/04/26 - 颱風討論

By Mia
at 2014-04-28T11:59
at 2014-04-28T11:59
Table of Contents
昨天週日(27日)鋒面系統如預期的在白天期間通過台灣上空
從台北的觀測資料可以看出風向較大的變化有兩個時間點,
一個是在中午過後(12~13時)之間鋒面通過,
從原本的偏西到偏南風向轉變為偏西到偏北風向,
另一個時間點是在晚間的20~21時左右,北方冷高壓前緣到達北台灣,
風向又從偏北風轉為偏東風,東風一吹起後,臺北盆地內就可以感受到風力明顯增強了。
http://ppt.cc/8MCl
溫度上的變化則是從鋒面通過後就開始一路緩降,也就是從北風出現就逐漸降溫了,
一直到今天清晨降到低點,但也不是很低,只有21.9度,
上午開始溫度就逐漸上升,冷空氣的影響非常弱。
http://ppt.cc/tDIM
雖然鋒面如預期的通過,但是天氣上的表現卻跟預期的差異很大,
降雨等不穩定的雲雨帶系統都在鋒面前方的暖濕水氣輸送帶區域發展,
等到鋒面本身通過時反而沒有帶來明顯的天氣現象。
雖然自己看天氣已經很多年,但是遇到這種狀況還是很容易被騙,
再一次顯示綜觀系統跟中小尺度系統之間預測的難易程度,
有鋒面系統要通過基本上一定會預報可能出現降雨,
而且前一天週六的狀況也顯示鋒面上對流很活躍,大氣並不穩定,
因此做出了週日鋒面通過時可能出現較大雨勢的預測,
不過老天爺大概故意開預報人員的玩笑,降雨系統落在台灣東部海面,
雖然很近,但是對陸地上就是沒有影響,民眾感受更是差了十萬八千里,
不過沒有下大雨對陸地上造成災害也是好事,
只能請大家對於預報的不確定性多多包涵了......
今天如昨天預期的是在較乾空氣的影響下,各地天氣都還不錯,
華南有些淺薄的中高層雲飄過來,但是越往東靠近台灣就越消散,
有時雲量多一點,不過應該都不會有明顯的天氣現象,
今晚到明晨間迎風面地區仍有點零星的地形降雨機會,
另外就是中部以北到東北部地區夜晚清晨的溫度還是會稍微有點涼意,
明天看起來華南過來的雲層有增多的趨勢,連帶會造成台灣的雲量增多,
不過空氣還算是偏乾,降雨應該還是比較有限,
等到週三起水氣會增加,配合華南雲系以及高空短槽東移,天氣又會有新的變化,
這部分晚上有空再來為大家說明,先簡單供參考~
--
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颱風
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