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#flooding

23 innlegg17 deltakereett innlegg i dag
Replied in thread
Anne Ominous

@Sustainable2050

Japan is getting it too

"The Japan Meteorological Agency (JMA) reported more than 370 mm (14.6 inches) of rain in Tamana City in just six hours, a local record and nearly double the average August total. Some areas in Kumamoto received over 400 mm (15.7 inches) in 24 hours.

The deluge caused rivers to overflow, inundating roads and residential areas, while landslides destroyed homes and blocked access routes."

#flooding #ExtremeWeather

watchers.news/2025/08/11/multi

Flooding in Kamiamakusa City, Kumamoto Prefecture, Japan.
The Watchers · Multiple missing, over 3 million advised to evacuate after extreme rainfall hits Kyushu, JapanAv Reet Kaur
Anne Ominous

recent destructive flooding roundup:

China, Japan, India, Taiwan, Australia, Mexico

this happens so often now, in so many places - torrential rain dumping huge amounts of water, it is clear that #climateChange isnt filling up the seas like a bathtub. it's the violent displacement of massive amounts of water

watchers.news/2025/08/08/yuzho

watchers.news/2025/08/08/heavy

watchers.news/2025/08/05/destr

watchers.news/2025/08/05/destr

watchers.news/2025/08/02/hundr

watchers.news/2025/08/08/tropi

Cars getting swept away by floodwaters in Yuzhong County, Gansu Province, China on August 8, 2025. Credit: Volcaholic
The Watchers · 10 dead, 33 missing after Yuzhong County, China, receives half a year’s rainfall in 24 hoursAv Rishav Kothari
#ExtremeWeather#weather#flooding
Fortsettelse av samtale
anlomedad

Does heavy rain occur more often in the late summer evening hours than in the early evening?
3/

I dug in some more.
I don't know the first thing about statistics so I don't know how to professionally put a figure to significance.
But I noticed that many of my positives, where late evening rain occurs more often than early evening rain, only had minor differences in occurrences in comparison.
This still means that late evening strong-ish rain larger than early evening rain is very common – contrary to the expert opinion.
But if I want to figure out what the underlying weather physics might be, I need to constrain the selection further.
So I took the number of events where Late Evening strong rain with 4-10mm/hour comes "out of the blue", meaning has no preceding strong rain (here >=4mm, open end!) in the early evening hours
and compared the number to
the station's number of events where an early evening has a 4-10mm event.
The difference of late versus early is then expressed as % of the total number of events of 4-10mm rain.
And if this is 12.5% or higher, I call it significant.

4-10mm per EVENING hour occurs once per summer in July-August, so is quite rare, but the events since 2005 are still numerous enough to do something with them. (The Alpine region gets plenty more evening events tho!)
Rain >=10mm/hour is too rare, occurring only every 3rd year or so, which is an average of only 8 summer evening events per station. Too few to compare early and late events.

The screenshot shows the % significance on the left hand side and the 25 station locations on the map.
I zoomed into the 10 most significant stations in Google Earth and noticed that all but one are located a few kilometres East of a slightly elevated and forested strip of land.
This might be a pointer – or it might not 😁

It is promising to see a clear cluster in the mid West and mid East of the country, also suggesting an underlying physical reason, as opposed to the late summer evening events being a mere fluke.

Next step is to grab evening event dates and look at them in context of the wider weather system synopsis:
dwd.de/EN/ourservices/wetterla
The data is linked to where it says "Download of the weather type classification data and additional forecast data (txt, 2MB, " on the right-hand side.

#ClimateChange#ExtremeWeather#heavyRain
DoomsdaysCW

Officials issue highest-possible weather alert amid record-breaking #downpour: 'Black rainstorm warning'

Timothy McGill
Wed, August 6, 2025

"Torrential rain fell on Hong Kong recently, breaking a long-held record and disrupting life in one of the most densely populated urban centers in the world.

"The 'black rainstorm warning,' issued by the Hong Kong Observatory, represents the most severe level of rainstorm alert in #HongKong. It's triggered when torrential rain is causing or likely to cause serious #flooding and major #disruptions.

"In early August, the #HKO issued this dire warning not once, but four times in only eight days, setting a new benchmark for the most times the city's highest weather alert has been issued in a single year, according to China's state news agency Xinhua, per Reuters."

yahoo.com/news/articles/offici

Yahoo News · Officials issue highest-possible weather alert amid record-breaking downpour: 'Black rainstorm warning'Av Timothy McGill
#ExtremeWeather#HongKongWx#ExtremeRain
MediaFaro Longreads

‘The forest had gone’: the storm that moved a mountain.

On a small ledge in the Swiss mountains, 200 people were enjoying a summer football tournament. As night fell, they had no idea what was coming

mediafaro.org/article/20250805

The Guardian · ‘The forest had gone’: the storm that moved a mountain.Av Jonah Goodman
#ExtremeWeather#Environment#Italy
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