0804天氣說明 - 台南
By Isabella
at 2021-08-04T10:20
at 2021-08-04T10:20
Table of Contents
目前西南外海有一線狀回波接近,預計1240臺南市區有強降雨,偶有雷聲強陣風
外出請多加小心,記得攜帶雨具
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0804天氣說明
目前臺灣處於低壓帶中,主要受到兩個熱帶性低氣壓影響
一個是在臺灣東北海面,清晨兩點中心位置23.6N,125.2E,以6Km/h朝北北東方向移動
另一個是在海南島海面,清晨兩點中心位置21N,114.7E,以10Km/h,朝東北東方向移動
,即在高雄市西南方605Km海面上[B
未來對臺灣南部有直接影響的是海南島這個熱帶性低氣壓,主要針對它做說明
受到海南島的熱帶性低氣壓外圍影響,西南風增強,臺灣西南海面上容易有對流發展,伴
隨風場移入後就有陣雨
後續熱帶性低氣壓視其在海面上的時間,在今日有機會升格為颱風(盧碧),
颱風移動方向及移速主要受到兩個條件影響,一個是其本身內在力量,會朝北朝西移動,
另一個就是駛流場(即隨高壓勢力邊緣移動)
但由於今年高壓勢力偏弱,熱帶性低氣壓又位在低壓帶當中,將導致其移向不明顯,移速
緩慢
目前主流的預報路徑是今天白天熱帶性低氣壓在南海緩慢朝東偏北移動,後續太平洋高壓
勢力緩慢增強,高壓軸線在呂宋島,致熱帶性低壓在8/5凌晨沿福建南部通過臺灣海峽
金門,馬祖及澎湖將首當其衝的受到影響,建議今天完成防颱相關準備
由於這個熱帶性低壓對流發展旺盛是在其南面,被高壓頂上福建後,臺灣一帶的西南風將
增強為西南氣流,自8/4晚間起至8/8日,南部將持續有大雨狀況,雨量勢必驚人,低窪地
區建議將貴重物品移往高處,山區留意土石坍塌狀況
8/4中午前,南部地區西南風影響,天氣以多雲偶陣雨狀況為主,下午西南風逐漸增強,
加上熱力作用,海面上的對流會不斷生成,移入後就有大雨
8/5受到熱帶性低氣壓外圍環流影響,南部地區及金門、澎湖整日有大雨偶有雷狀況,另
請金門澎湖慎防強陣風
8/6-8/8南部地區受到西南氣流影響,整日強降雨,金門、澎湖8/7下午脫離熱帶性低氣壓
環流,天氣開始好轉
這是依照中央氣象局預測路徑,推估各天影響狀況,後續視實際熱帶性低氣壓動向做滾動
式修正
以南部地區而言,雖然目前資料顯示不登陸,但是將帶來大雨影響可能勝過於登陸的狀況
請在今天做好防澇相關準備,以上言論僅供討論,氣象預報請以氣象局為主
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