Mountains in central and southern Taiwan battered by rain in wake of typhoon
Mountains in central and southern Taiwan battered by rain in wake of typhoon
2023-08-04
Typhoon Khanun may have left Taiwan, but Taiwan’s central and southern mountains were still bombarded with rain brought in by southwesterly winds Friday. The Central Weather Bureau issued heavy rain warnings in several areas on Friday, with the central county of Nantou receiving an "extremely torrential rain" warning. By 8:00 p.m., Nantou’s Ren’ai Township had accumulated more than 700 millimeters of rain, while accumulated rainfall in Chiayi and Kaohsiung broke the 300-millimeter mark. The CWB says this latest rain spell won’t let up until Sunday or even Monday when the southwesterlies weaken.
As Typhoon Khanun moves away from Taiwan, Yilan, now on the leeward side has been blasted by downslope winds and Foehn winds. Potted flowers and fruit trees on roadsides are parched from the heat.
Temperatures in this eastern county have risen sharply since Thursday night and at around 2:00 a.m. on Friday, a temperature of 36.1 degrees was measured in Yilan’s Dongshan Township. Foehn winds are heating up the island’s entire eastern half, with Chenggong Township in Taitung also experiencing an extremely high temperature of 37.7 degrees.
Chen Kao-chu
Yilan weather station
Yesterday evening on Aug. 3 and in the early hours of this morning, an even stronger southwesterly air current came in. All the rain fell on the west side of the mountains, so for those of us on the eastern side, that brings down hot air.
While Taiwan’s eastern half baked in the heat, the western half was affected by the tail of Typhoon Khanun and southwesterly winds, which brought heavy rains throughout.
Chu Mei-lin
CWB forecaster
In the south of a low pressure system that’s part of the monsoon, there’s a relatively strong southwesterly wind, and Taiwan is on the north side of the southwesterly winds. Some southwesterly winds are also blowing into the Taiwan Strait. Therefore the region of the Taiwan Strait is mainly an environment with westerly winds. This makes the mountainous areas have more continual and significant rain.
Ren’ai Township in Nantou County had the most accumulated rainfall in Taiwan, and that caused many accidents. For instance, a landslide left the Indigenous Toda Village cut off to the outside world.
Typhoon Khanun’s outer bands also brought storms to mountainous areas in Chiayi. Train services on the main and branch lines of the Alishan Forest Railway were suspended due to landslides.
The Central Weather Bureau forecasts that Taichung, Nantou and mountainous areas south of Chiayi will continue to see rain through Saturday night and until Sunday.
Chu Mei-lin
CWB forecaster
Torrential rains will continue hitting the area. Looking at the situation now, the daily accumulated rainfall may be more than 350 millimeters in the next day or two.
The rain’s not expected to let up significantly until Sunday or Monday at the earliest. Residents in the central and southern regions are advised to remain alert.
卡努遠離西南風發威 超大豪雨狂炸中南部山區
2023-08-04
卡努颱風遠離後，換西南風發威，雨彈狂炸中南部山區，氣象局啟動較大規模豪雨作業，更針對南投發布"超大豪雨"特報，仁愛鄉累積至週五晚上8點，雨量超過700毫米，嘉義和高雄雨量也都突破300毫米，氣象局提醒這波降雨，最快要到週日或下週一，西南風減弱後，才會明顯趨緩。
中颱卡努朝台灣東北方遠離，位於背風側的宜蘭，受過山沉降作用影響，颳起焚風，路邊盆栽的花草和果實，更疑似熱到出現枯黃現象。
宜蘭從週四入夜後氣溫就直線上升，週五凌晨兩點更在冬山測得36.1度高溫，而其實整個東半部都有焚風發生機率，台東成功也出現37.7度的極端高溫。
[[宜蘭氣象站主任 陳高鋤]]
“昨天(3日)晚間跟今天凌晨，更強的西南氣流引進，然後雨都下在山的西邊，我們東邊剛好是沉降作用。”
東半部熱翻、西半部則是受颱風尾發威、西南風影響，下起豪雨。
[[氣象局資深預報員 朱美霖]]
“季風低壓帶的南邊有比較強勁的西南風，而台灣在西南風的北側，台灣海峽也有一些西南風吹進來，所以在台灣海峽這一帶，主要是一個偏西風的環境，使得山區有一些比較持續性的顯著雨勢。”
週五南投縣仁愛鄉，累計雨量，是全台最多，災情也不少，都達村出現土石流，對外道路中斷。
颱風外圍環流，同樣在嘉義山區帶來暴雨，阿里山森林鐵路也發生土石滑落，造成本線和支線全部停駛。
氣象局預告，週六白天台中、南投以及嘉義以南山區，入夜後到週日雨勢持續。
[[氣象局資深預報員 朱美霖]]
“未來持續可能還是會有這種大豪雨的降雨，現在看起來的話，這種日累積雨量在未來一兩天，可能都是有350毫米以上。”
最快要到週日或下週一，降雨才會明顯趨緩，中南部民眾還是不能掉以輕心。
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