天氣速觀:再看秋颱環境場,週五全台有機會降雨 - 颱風討論
By Zenobia
at 2020-10-21T07:31
at 2020-10-21T07:31
Table of Contents
天氣速觀:再看秋颱沙德爾的共伴環境場,週五全台有機會一起降雨
一連三天看台灣共伴環境場,最新模式預報,
沙德爾颱風的水氣週五飄上來,全台有機會一起降雨。
目前北方西風槽正快速壓下來,但就是還沒下來,
因此昨晚至今早仍是沙德爾颱風的外圍環流進來,
不過昨晚和今早的環境場已經不大一樣,
昨晚,太平洋高壓從沙德爾颱風和20W之間伸上來,
並且在琉球海域東側出現另一個高壓單體,
因此,
昨晚的高空場是沙德爾颱風和太平洋高壓推擠,
地面場則是:
沙德爾颱風外圍環流的東南風轉東風 與
東北亞出海減弱的地面冷高壓東北東風 輻合。
=> 昨晚高空場 少了西風槽, 地面場少了大陸冷高壓;未有共伴
今早,西風槽還沒下來,但太平洋高壓開始往東讓位,
沙德爾外圍環流逐漸上來台灣東部外海,因此台灣東部開始降雨;
在高空場,沙德爾的外圍環流場已頂到台灣東部外海,但西風槽未到,
在地面場,兩地面冷高壓分別在在新疆和內蒙古,冷空氣勢力不強,
但兩冷高壓聯手已經乾冷空氣勢力擴及華南,
因此,今早開始,地面場逐漸為:
東北季風的北北東風 和 沙德爾颱風外圍環流的東南東風 (類)共伴;
=> 今早高空場 少了西風槽, 地面場有(類)共伴
結論:隨著 沙德爾颱風外圍環流 上來, 環境東北季風下來,
北部和東部今天雨量增多,宜蘭依舊要留意共伴出現了。
不過,目前模式看來,
西風槽周五才會壓下來,太平洋週五才會完全東退,
而週五沙德爾颱風在南海短暫滯留,
模式顯示,沙德爾颱風到底還是沒接上西風槽前噴流,共伴條件仍差;
但好消息是,
沙德爾的外圍環流上來,週五全台有機會降雨;
隨後,
也是週五起,就是乾冷空氣大軍團來了。沙德爾則繼續西行越南。
額外一提的驚人模式: 10月颱風秀不僅如此,
模式預報下週還有雙颱,一個接一個哇哇哇,之後在觀察!
(快速說說,以上供參囉)
[ 本日16:36 速速觀:模式預報 對台灣的秋颱共伴越來越不存在 ]
https://imgur.com/a/24r4QSb
太平洋高壓位置完全走鐘,共伴條件越來越差,因此台灣的共伴降雨變得緩和許多
因此,明天的東北季風南下後,共伴環境往東偏向沖繩一帶了。
看來日本南方出現的˙20W的影響頗大,太平洋高壓西伸的配置整個往南移了不少。
所以模式顯示的共伴條件越來越差;
目前連蒙古冷高壓的達標東北季風都還沒下來,太平洋高壓就整個亂了套了
因此,嚴格定義來看,這次的對台灣的秋颱共伴似乎可以說不存在囉!
主要降雨是外圍環流,以及東北風和偏東風輻合的降雨
模式來看,高空場可以確定不利秋颱共伴的環境
頂多就是 明天東北季風下來後,外圍環流和東北季風在地面場的一些(類)共伴情形了
至於週五,目前來看還是會有水氣上來台灣。
(太平洋高壓從沙德爾颱風後面推,水氣沿著高壓邊緣匯入西風槽。
但很快槽後脊就抑制水氣北上了。)
--
一連三天看台灣共伴環境場,最新模式預報,
沙德爾颱風的水氣週五飄上來,全台有機會一起降雨。
目前北方西風槽正快速壓下來,但就是還沒下來,
因此昨晚至今早仍是沙德爾颱風的外圍環流進來,
不過昨晚和今早的環境場已經不大一樣,
昨晚,太平洋高壓從沙德爾颱風和20W之間伸上來,
並且在琉球海域東側出現另一個高壓單體,
因此,
昨晚的高空場是沙德爾颱風和太平洋高壓推擠,
地面場則是:
沙德爾颱風外圍環流的東南風轉東風 與
東北亞出海減弱的地面冷高壓東北東風 輻合。
=> 昨晚高空場 少了西風槽, 地面場少了大陸冷高壓;未有共伴
今早,西風槽還沒下來,但太平洋高壓開始往東讓位,
沙德爾外圍環流逐漸上來台灣東部外海,因此台灣東部開始降雨;
在高空場,沙德爾的外圍環流場已頂到台灣東部外海,但西風槽未到,
在地面場,兩地面冷高壓分別在在新疆和內蒙古,冷空氣勢力不強,
但兩冷高壓聯手已經乾冷空氣勢力擴及華南,
因此,今早開始,地面場逐漸為:
東北季風的北北東風 和 沙德爾颱風外圍環流的東南東風 (類)共伴;
=> 今早高空場 少了西風槽, 地面場有(類)共伴
結論:隨著 沙德爾颱風外圍環流 上來, 環境東北季風下來,
北部和東部今天雨量增多,宜蘭依舊要留意共伴出現了。
不過,目前模式看來,
西風槽周五才會壓下來,太平洋週五才會完全東退,
而週五沙德爾颱風在南海短暫滯留,
模式顯示,沙德爾颱風到底還是沒接上西風槽前噴流,共伴條件仍差;
但好消息是,
沙德爾的外圍環流上來,週五全台有機會降雨;
隨後,
也是週五起,就是乾冷空氣大軍團來了。沙德爾則繼續西行越南。
額外一提的驚人模式: 10月颱風秀不僅如此,
模式預報下週還有雙颱,一個接一個哇哇哇,之後在觀察!
(快速說說,以上供參囉)
[ 本日16:36 速速觀:模式預報 對台灣的秋颱共伴越來越不存在 ]
https://imgur.com/a/24r4QSb
太平洋高壓位置完全走鐘,共伴條件越來越差,因此台灣的共伴降雨變得緩和許多
因此,明天的東北季風南下後,共伴環境往東偏向沖繩一帶了。
看來日本南方出現的˙20W的影響頗大,太平洋高壓西伸的配置整個往南移了不少。
所以模式顯示的共伴條件越來越差;
目前連蒙古冷高壓的達標東北季風都還沒下來,太平洋高壓就整個亂了套了
因此,嚴格定義來看,這次的對台灣的秋颱共伴似乎可以說不存在囉!
主要降雨是外圍環流,以及東北風和偏東風輻合的降雨
模式來看,高空場可以確定不利秋颱共伴的環境
頂多就是 明天東北季風下來後,外圍環流和東北季風在地面場的一些(類)共伴情形了
至於週五,目前來看還是會有水氣上來台灣。
(太平洋高壓從沙德爾颱風後面推,水氣沿著高壓邊緣匯入西風槽。
但很快槽後脊就抑制水氣北上了。)
--
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