Annual rainfall in Yilan’s Ximao Mountain approaches 10,000mm
Annual rainfall in Yilan’s Ximao Mountain approaches 10,000mm
2022-11-02
The recent inclement weather has brought record rainfall to northeastern regions of the country, including Yilan’s Ximao Mountain, where 4,574 millimeters of rain fell in October alone. Forecasters say rain will continue until Friday, and seasonal winds will persist until Wednesday next week. Temperatures are also expected to drop to the mid teens by next week.
Northeasterly winds, combined with peripheral effects of a recent storm and typhoon, have brought extremely heavy rainfall to Yilan in recent days. Especially hard hit was this mountainous area, which has the highest accumulated rainfall nationwide so far this year.
A post on a Facebook page where people discuss typhoons in Taiwan brought attention to rainfall data collected on Yilan’s Ximao Mountain.
Total rainfall for October reached 4,574 millimeters. That’s the heaviest rainfall recorded by any weather station in Taiwan over the course of the month. Since the beginning of the year, the mountain has seen more than 9,500 millimeters of rain. One meteorologist says the area could see more than 10,000 millimeters before the year ends.
Chen Kao-chu
Yilan weather station
The peripheral effects of typhoons combined with northeasterlies both impacted local weather in the county. There’s also Datong Township in Nan’ao, where there is a windward mountain face that always gets rainfall. On some days more than 1,000 millimeters of rain will fall on that mountain.
Previously, the Central Weather Bureau had named Daping in New Taipei’s Wanli District as the rainiest place in Taiwan. The village gets an average of more than 6,500 millimeters of rain every year. Now that a weather station has been installed on Ximao Mountain, it could be a contender for rainiest place.
Liu Yu-chi
Forecaster
Information from both our manned weather station and our automatic weather sensors confirmed that October rainfall there was the highest. However, the Ximao weather station only has five years’ worth of weather data, and to really understand a location’s weather patterns we need to look at 30 years of data. That’s the only way to get a complete picture of the area’s climate.
As Ximao’s sensors have not been in place for very long, there is not enough historical data to determine whether Ximao could dethrone Daping as the rainiest place in Taiwan. Meanwhile, with rain continuing unabated in Yilan, Keelung and mountainous areas near Taipei, the weather bureau has been issuing heavy rainfall warnings.
Liu Yu-chi
Forecaster
The rain is likely to continue until Friday, and maybe throughout the weekend. There will be some rainfall all across Taiwan. Moisture will start to decrease, and by Monday we should start to see the rain dissipate.
By Wednesday or Thursday, the northeasterlies will begin to weaken and the weather will improve. However, northeasterly winds are expected to pick up again by the end of next week, bringing temperatures down to roughly 16 degrees until Sunday in the plains.
新雨王出爐 南澳西帽山年雨量逼近1萬毫米
2022-11-02
受到颱風外圍環流和東北季風共伴效應，宜蘭前幾天豪雨不斷，現在雨王排行榜也刷新紀錄，南澳西帽山，光是10月就累積雨量就高達4574毫米，年雨量更超過9500毫米，相當驚人。不過氣象局指出西帽山是自動測站，而且2018年才架設，資料還不夠齊全，所以不列入正式紀錄。
東北季風加上颱風外圍環流，讓宜蘭這幾天豪雨不間斷，尤其這個地方，更奪下雨王寶座！
台灣颱風論壇PO出10月雨量統計，南澳的西帽山奪冠。
累積雨量高達4574毫米，堪稱破紀錄，年雨量更驚人，飆破9500毫米。有機會全年破萬毫米。
[[宜蘭氣象站主任 陳高鋤]]
“颱風外圍環流，還有東北季風雙重影響，南澳還有大同鄉的迎風面山坡就容易累積雨量，它有時候一天單日會超過1000毫米”
過去大家最熟悉的雨王，是萬里區的大坪，以年平均雨量超過6500毫米奪冠，不過西帽山2018年新設測站，異軍突起，剛好十月多颱風，刷新紀錄。
[[氣象局預報員 劉宇其]]
“它確實是我們氣象局人工站跟自動站有統計資料以來，單月最大的累積雨量，但是西帽山這個測站，因為它本身只有5年歷史資料，我們要了解一個地方氣候特性，會需要30年的資料累積，這氣候特性才會比較完整”
考量西帽山是自動測站，架設時間也不長，資料不全，氣象局不列正式紀錄。
最近雨一直下，氣象局持續針對宜蘭、基隆北海岸和北市山區，發布大雨特報。
[[氣象局預報員 劉宇其]]
“可能到禮拜五或整個週末都還是會持續，全台各地都會有一些降雨。水氣比較減少，預計要到下禮拜一才會逐漸緩和下來”
週三到週四，東北季風逐漸減弱，天氣會轉晴朗，但兩天空檔後，下波東北季風又報到，平地下探16度，要到週日才會回溫。
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