低溫特報首發,留意10度低溫~2015/12/15
今年入冬的第一個低溫特報下午正式發布,
目前冷空氣正在持續南下,預估今晚起降溫幅度將會逐漸加大,
明晚到後天之間,中北部地區的朋友要留意10度或以下的低溫出現機會,
嚴防低溫對人體健康及農漁牧業可能造成的影響。
從上午的850百帕(約1500公尺高度)天氣圖來看,0度等溫線幾乎占據南嶺以北區域,
兩湖盆地隱約有反氣旋狀風場,分裂高壓中心可能在這邊建立,
高空冷渦位於中國東北,還沒有看到非常強的地面氣旋爆發拉扯,
http://i.imgur.com/OfmIoCr.png

跟11月底南下的冷空氣路徑走向偏東的情況不同,
這一波冷空氣南下的路徑明顯較為偏西,
預期冷空氣主力對台灣的影響程度應該會比前一波要強上許多。
兩天後的地面預報風場也顯示偏北風將長驅直入南海,
甚至可以一直吹到南海南部,北風往南侵襲的程度似乎會相當大,
http://i.imgur.com/dGuUlV3.jpg

可能代表冷空氣隨之往南的幅度也會很大,對於降溫的狀況要特別小心注意。
這一波冷空氣空氣偏乾,因此還要留意是否出現明顯的輻射冷卻效應,
特別是在17日以及18日的清晨,
一但風勢減小,天空放晴的時候,就要留意輻射冷卻是否會發生,
並且帶來局部性的極低溫。
最後要提醒的就是北風可能帶來的境外汙染物對於空氣品質的影響,
特別是PM2.5細懸浮微粒的濃度今晚到明天有機會偏高,
各地區,尤其是呼吸道敏感的朋友要小心這種又冷又乾又髒的空氣對人體的影響。
以上簡單供參考囉~
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