Super Typhoon Hagibis threatens Japan

Gaoth Laidir · 12-10-2019 8:08pm

They've just shown that 1001 mm fell in 48 hours at Hakone

Chris_5339762 · 12-10-2019 9:03pm

Thats a METER of rain. Imagine a meter of rain falling in the Wicklow mountains and what that would do to the rivers.

igCorcaigh · 12-10-2019 10:27pm

Chris_5339762 wrote: »

Thats a METER of rain. Imagine a meter of rain falling in the Wicklow mountains and what that would do to the rivers.

I can never know how to conceptualise rainfall by the height measure...

I think, the size (radius) of the collecting device doesn't matter, is that correct? As in the area of the device and the rainfall cancel each other out, mathematically speaking?

Yet we talk of mm or inches of rain over many hours. I'd imagine leaving a bucket out in a heavy shower would collect a lot more than that? Am I thinking about it incorrectly?

josip · 12-10-2019 10:29pm

igCorcaigh wrote: »

I can never know how to conceptualise rainfall by the height measure...

I think, the size (radius) of the collecting device doesn't matter, is that correct? As in the area of the device and the rainfall cancel each other out, mathematically speaking?

Yet we take of mm or inches of rain over many hours. I'd imagine leaving a bucket out in a heavy shower would collect a lot more than that? Am I thinking about it incorrectly?

A 30cm high bucket with straight sides, would have been filled over 3 times

gozunda · 12-10-2019 10:33pm

Gaoth Laidir wrote: »

They'e now saying there's just been an earthquake offshore to the southeast but there is no danger of a tsunami. That's all they need...

Always reckoned that if there is a god - he doesn't like Japan particularly much ...

igCorcaigh · 12-10-2019 10:33pm

josip wrote: »

A 30cm high bucket with straight sides, would have been filled over 3 times

Well that is a lot, but I'm more talking about the general point. I must try it sometime, leaving a bucket out and seeing how much water it collects.

Gaoth Laidir · 12-10-2019 10:34pm

igCorcaigh wrote: »

I can never know how to conceptualise rainfall by the height measure...

I think, the size (radius) of the collecting device doesn't matter, is that correct? As in the area of the device and the rainfall cancel each other out, mathematically speaking?

Yet we talk of mm or inches of rain over many hours. I'd imagine leaving a bucket out in a heavy shower would collect a lot more than that? Am I thinking about it incorrectly?

It's simply the depth of water that would accumulate on a horizontal solid surface from all the rain. 1 mm is equivalent to 1 litre per metre squared. If you had a flat tray of sides 1 metre x 1 metre, 1 mm is the depth that would accumulate if you pour 1 litre of water into it. That same tray up in Hakone has had 1001 litres (1 tonne) of water poured into it overt he past two days.

fryup · 12-10-2019 10:48pm

M.T. Cranium wrote: »

Just watching news here, an eyewitness account from south of Tokyo seemed to be saying that a damaging tornado occurred fairly early in the event,

a tornado within a hurricane? is that common?

Gaoth Laidir · 12-10-2019 11:09pm

fryup wrote: »

a tornado within a hurricane? is that common?

They are known to sometimes occur in the rain bands well out ahead of an approaching hurricane. You'll often see reference to them in the NHC advisories.

pauldry · 13-10-2019 2:20am

So as I said before now typhoon is gone Scotland game should be ok.....bar floods

Gaoth Laidir · 13-10-2019 8:39am

It's going ahead alright

https://twitter.com/rugbyworldcup/status/1183198965795147776?s=19

Gaoth Laidir · 13-10-2019 1:20pm

Windwise Hagibis was a fairly tame Cat 1 on landfall. The major story was the rain.

http://tropic.ssec.wisc.edu/real-time/archerOnline/cyclones/2019_20W/web/track.png

The highest gusts recorded anywhere on the islands or mainland were

87 kt - Kozushima Island (see map).
85 kt - Yokohama
84 kt - Tokyo Haneda Airport

The highest 10-minute mean speed I could find was 67 knots at Haneda airport.

Rainwise, I think Hakone was the highest total, with 1001 mm overall, 922.5 of which fell in 22 hours yesterday...

mrtom · 14-10-2019 2:31pm

I have read that Hagbis has pumped so much warm moist air into the upper atmosphere that it is causing the jet stream to accelerate due to the sharper contrast in temperatures.

What if any impact would be observed here ?

Gaoth Laidir · 14-10-2019 3:29pm

mrtom wrote: »

I have read that Hagbis has pumped so much warm moist air into the upper atmosphere that it is causing the jet stream to accelerate due to the sharper contrast in temperatures.

What if any impact would be observed here ?

That happens anywhere that there's a difference between tropical and more polar airmasses. It happens over the Atlantic too, especially when cold polar air comes off NE Canada/Greenland. There's nothing special about Hagibis in this regard.

pauldry · 14-10-2019 6:42pm

Now that Typhoon Bagpuss is over we go back to concentrating on our own non stop typhoons and floods

M.T. Cranium · 17-10-2019 1:57am

pauldry wrote: »

So as I said before now typhoon is gone Scotland game should be ok.....bar floods with Scottish rugby fans.

FYP

M.T. Cranium · 17-10-2019 2:06am

I saw a news headline yesterday stating that the death toll from this event was 48. Considerable and always tragic but given the population of the region, a far cry from the worst case scenario. My daughter was on a holiday trip to Kyoto last year when that other typhoon came ashore in Osaka. She said that while the media in Japan issue plenty of warnings and information, the concept of everyone going to safety is a bit eroded by the non-stop pace of Japanese commerce (that one hit mid-day during the working week too). Some of the handful of casualties in that typhoon occurred when people at work were killed, either by falling objects or being delivery drivers in blown-over trucks.

After the headline about the 48 deaths, I never saw the actual story but I assume that most of those would have been caused by flooding, as well as the small toll caused by that localized tornado. As GL commented, that's quite a normal feature of hurricanes and typhoons and they do tend to occur well out in advance of the core in rain bands that develop severe storm cells. They often move southeast to northwest in the northern hemisphere. I can't recall any that caused fatalities before this one, but they have probably happened in some North American storms. This should be considered separate from any descriptions of small intense cores like Andrew (1992) developing "tornado-like" eyewalls. This activity is well out ahead of the core rather than near the eyewall, let's say 150-300 miles as a rough estimate.

Super Typhoon Hagibis threatens Japan

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