Nevicate più abbondanti in 24 ore in Italia

[jojoski]

In realtà in Giappone ci sono casi ufficiali di nevicate giornaliere oltre i due metri in località abitate di bassa quota e di 180 cm in città costiere.
Per il resto una nevicata record è per definizione un evento eccezionale, quindi non ha molto senso parlare di cosa succede in media. Certe zone dell'Appennino possono assolutamente fare 200 mm giornalieri in inverno, che nelle condizioni giuste possono tradursi anche in 250 cm di neve in teoria.

hello
Where did you find such 180-200 cm numbers ?
I Know MT Ibuki 1927 record but in lower regions I can't find more than 160 cm a day in a lot of files on my computer even in very snowy places (but a lot of years with 110-150 cm/24 h )
Tsunan 24 h max 150 cm (1967) for a long period 1961/2020 https://www.town.tsunan.niigata.jp/u...43747_misc.pdf
Ketto near tsunan max since1976 24 h max 147 cm (average season snowfall 1700 cm) https://www.town.tsunan.niigata.jp/u...43748_misc.pdf
Myoko since 1995 160 cm ??????-????-
Matsunoyama since 1995, 130 cm (total of afternoon and morning numbers)
??????-???-
near coast Tagada 120 cm on JMA 気象庁｜過去の気象データ検索
but JMA Numbers for snowfall have huge problems of method with automatic stations = sum of 24 hourly snowdepht differences

[burian br]

hello
Where did you find such 180-200 cm numbers ?
I Know MT Ibuki 1927 record but in lower regions I can't find more than 160 cm a day in a lot of files on my computer even in very snow places (but a lot of years with 110-150 cm/24 h )

Tsunan 24 h max 150 cm (1967) for a long period 1961/2020 https://www.town.tsunan.niigata.jp/u...43747_misc.pdf
Ketto near tsunan max since1976 24 h max 147 cm (average season snowfall 1700 cm) https://www.town.tsunan.niigata.jp/u...43748_misc.pdf
Myoko since 1995 160 cm ??????-????-
Matsunoyama since 1995, 130 cm (total of afternoon and morning numbers)
??????-???-
near coast Tagada 120 cm on JMA 気象庁｜過去の気象データ検索
but JMA Numbers for snowfall have huge problems of method with automatic stations = sum of 24 hourly snowdepht differences

Very interesting!

We have the "myth" (in a positive sense) of Japan cause of the deep snow cover also at low levels in some regions, so we assume such a big amount of snow (2 meters or more) in 24 hrs is not only absolutely plausible, but probably it really occured.

Thank you very much for the data!

[nevearoma]

hello
Where did you find such 180-200 cm numbers ?
I Know MT Ibuki 1927 record but in lower regions I can't find more than 160 cm a day in a lot of files on my computer even in very snowy places (but a lot of years with 110-150 cm/24 h )
Tsunan 24 h max 150 cm (1967) for a long period 1961/2020 https://www.town.tsunan.niigata.jp/u...43747_misc.pdf
Ketto near tsunan max since1976 24 h max 147 cm (average season snowfall 1700 cm) https://www.town.tsunan.niigata.jp/u...43748_misc.pdf
Myoko since 1995 160 cm ??????-????-
Matsunoyama since 1995, 130 cm (total of afternoon and morning numbers)
??????-???-
near coast Tagada 120 cm on JMA 気象庁｜過去の気象データ検索
but JMA Numbers for snowfall have huge problems of method with automatic stations = sum of 24 hourly snowdepht differences

You're not gonna find any data unless you dig deeper into local/regional archives. Most of the records are from the first half of the century.

[jojoski]

You're not gonna find any data unless you dig deeper into local/regional archives. Most of the records are from the first half of the century.

About JAPAN i don't have numbers from 1rst part of 20 century except few from JMA and Tokamachi (snowlab) studies wich begins in 1943 for snowfall ( 1918 for snowdepht )


Tokamachi is in the heart of snowcountry region but daily snowfall records are lower than neighbours : top 3 : 100 cm ; 105; 105 cm and far from Italian records
Table21 of this very complete doc: https://www.jstage.jst.go.jp/article.../_pdf/-char/ja
Tokamachi snowlab 十日町試験地 / 最新の積雪情報と気象

About method , at Matsunoyama 1995 2020
with " HS difference 9AM to 9AM " method, the top 3 , 24 hours snowfall woud be 110 cm (178->288 13-01-2010) , 85 cm and 84 cm
Tavoletta method : (total of afternoon and morning numbers) top 3 : 130 cm, 130cm, 117 cm

[est]

About JAPAN i don't have numbers from 1rst part of 20 century except few from JMA and Tokamachi (snowlab) studies wich begins in 1943 for snowfall ( 1918 for snowdepht )


Tokamachi is in the heart of snowcountry region but daily snowfall records are lower than neighbours : top 3 : 100 cm ; 105; 105 cm and far from Italian records
Table21 of this very complete doc: https://www.jstage.jst.go.jp/article.../_pdf/-char/ja
Tokamachi snowlab 十日町試験地 / 最新の積雪情報と気象

About method , at Matsunoyama 1995 2020
with " HS difference 9AM to 9AM " method, the top 3 , 24 hours snowfall woud be 110 cm (178->288 13-01-2010) , 85 cm and 84 cm
Tavoletta method : (total of afternoon and morning numbers) top 3 : 130 cm, 130cm, 117 cm

I've got some old data finded here:

Title ; Niigata-Ken kousekisetsu oyobi kion kansoku 30 nen hou (Snowfall and temperature observations in the Niigata prefecture, report of 30 years ) - Author; Niigata Prefecture - Publisher; Niigata Prefecture - Issued; 1999

Oshirakawa Shinden [37.3462193766001,139.1380262374878 (WGS84)], record HN 24h ("tavoletta" every 24h), 192 cm, 09/01/1986

Title ; Kisho-Nenkan 1995 (Meteorological Almanac 1995) - Author; supervised by JMA (Japan Meteorological Agency) and edited by JWA (Japan weather association) - Publisher; National Printing Bureau - Issued; 08/1995

Magawa (Toyama pref.)	180	28/02/1947
Takada (Niigata pref.)	176	09/02/1927
Santou (Niigata pref.)	170	31/01/1968
Shikabe (Hokkaidou pref.)	160	12/02/1963

About Ibuki 230 cm/24h snowfall of 14/01/1975 I'm 99% sure it's an error. You can check HS daily data here: 気象庁｜過去の気象データ検索
There are obviously some problems with that data and/or station (+3 m of HS difference between 10 and 11 January??), and if You check daily rainfall data of sourroundings stations there's no evidence of such heavy precipitations in so short time...

Scusate per OFFTopic

[nevearoma]

I've got some old data finded here:


Oshirakawa Shinden [37.3462193766001,139.1380262374878 (WGS84)], record HN 24h ("tavoletta" every 24h), 192 cm, 09/01/1986

Magawa (Toyama pref.)	180	28/02/1947
Takada (Niigata pref.)	176	09/02/1927
Santou (Niigata pref.)	170	31/01/1968
Shikabe (Hokkaidou pref.)	160	12/02/1963

About Ibuki 230 cm/24h snowfall of 14/01/1975 I'm 99% sure it's an error. You can check HS daily data here: 気象庁｜過去の気象データ検索
There are obviously some problems with that data and/or station (+3 m of HS difference between 10 and 11 January??), and if You check daily rainfall data of sourroundings stations there's no evidence of such heavy precipitations in so short time...

Scusate per OFFTopic

I didn't even know about that figure from Mt. Ibuki, but the local railway company (which used to measure snow regularly in the past decades) recorded 210 cm in 24 h at the Sekiyama station on 17/1/1946. Unfortunately these records are largely unavailable online.

[jojoski]

I've got some old data finded here: th_thumbup1.gif

One more time: "Est" talkings =first.jpg

[est]

One more time: "Est" talkings =first.jpg

merci

[jojoski]

There are obviously some problems with that data and/or station (+3 m of HS difference between 10 and 11 January??), and if You check daily rainfall data of sourroundings stations there's no evidence of such heavy precipitations in so short time...

Ibuki HS goes from 40-80 range to 300-400 or more incredibly fast on a lot of years, but most of changes above that are much smaller. Looks like huge snowdrift effect