Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by mikechamble »

melja wrote: Sun 30/05/2021 10:23 Mt sumers has just hit 400mm for the event with just under 200mm since midnight.

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Wow that is off the charts beyond even the MetService high limit in the warning! Considering we've still got so much to go, this has all the potential to be a really dangerous and significant event.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by snowstormwatcher »

melja wrote: Sun 30/05/2021 10:23 Mt sumers has just hit 400mm for the event with just under 200mm since midnight.

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Is that Rain Gauge in the Township or up in the Mountain? If its in the Township then that's a truly Remarkable amount and totals could even be higher Further back,That area is magnet for heavy Easterly rain.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by melja »

Ecan gauge

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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by Razor »

melja wrote: Sun 30/05/2021 10:23 Mt sumers has just hit 400mm for the event with just under 200mm since midnight.

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https://www.ecan.govt.nz/data/rainfall-data/
Last edited by Razor on Sun 30/05/2021 11:20, edited 1 time in total.
Reason: wrong quote
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by Razor »

I think we are watching unwanted history unfold here today folks
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by TonyT »

Razor wrote: Sun 30/05/2021 11:29 I think we are watching unwanted history unfold here today folks
Agreed, but at least this was expected. Could be an awful lot worse if caught unprepared.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by Bradley »

Just starting to pool here in West Melton, the ground took about 90mm but has had a guts full now and has given up soaking up the rain :lol:
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by Awhituobs »

https://www.ecan.govt.nz/data/rainfall- ... ils/316310

has peaked now , Mount Somers, the intensity, which peaked at 24mm an hour
which is not actually high compared to one off rain events (e.g tropical type thunderstorm down pours)
but its the duration of that heavy rain which is the key (i.e this is like a west coast of the south island rain event ! )
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by Cantab03 »

Some current Rainfall Totals for this event as we hit the midway stage for many....

Mt Somers 398mm
Geraldine Forest 290mm
Waimak Esk 245mm
Mt Hutt 221mm
Whiclteiffs 170mm
Hurunui 105mm
Akaroa 102mm

Christchurch ECAN Stations:
Ilam 62mm
Cashmere 62mm
Belfast 61mm
Christchurch Gardens 61mm
HoonHay 54mm
Halswell 51mm

Metservice Stations:
Darfield 125mm
Ashburton 110mm
Christchurch 70mm
Timaru 62mm
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by Awhituobs »

basicly a whole months worth of rain for the city in 2 days
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by Chris W »

That’s staggering at Somers, even for the mountain.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by Bradley »

Looks like the end of the NE rain coming?
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by Awhituobs »

temporary I would say looking further out on the rain radar and the sat image
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by Cantab03 »

We have had very heavy rain here in the last 20 minutes thanks to what looks like a squall line heading directly east to west hitting the Southern half of Christchurch. 5mm in last 15 minutes.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by TonyT »

Bradley wrote: Sun 30/05/2021 15:08 Looks like the end of the NE rain coming?
The pivot point between the NE flow and the SE flow is starting to establish itself around Christchurch. Kinda like half time in the game. Pretty intense first half saw a lot of action. Will the second half live up to the pre-match speculation?
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by Cantab03 »

Easily the heaviest rain of this system over the last couple of hours. Feeding in directly from the east. Lots of surface flooding around the HoonHay/Halswell area with a couple of roads shut and water right over some other roads. Heathcote river very high again now, will be interesting at high tide tonight. Approaching 50mm for the day here now and 68mm for the event locally. Christchurch Airport now at 76mm for the event.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by Bradley »

TonyT wrote: Sun 30/05/2021 16:36
Bradley wrote: Sun 30/05/2021 15:08 Looks like the end of the NE rain coming?
The pivot point between the NE flow and the SE flow is starting to establish itself around Christchurch. Kinda like half time in the game. Pretty intense first half saw a lot of action. Will the second half live up to the pre-match speculation?
In your opinion could there be as much rain the 2nd half as the 1st half Tony?
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by TonyT »

Bradley wrote: Sun 30/05/2021 16:39
TonyT wrote: Sun 30/05/2021 16:36

The pivot point between the NE flow and the SE flow is starting to establish itself around Christchurch. Kinda like half time in the game. Pretty intense first half saw a lot of action. Will the second half live up to the pre-match speculation?
In your opinion could there be as much rain the 2nd half as the 1st half Tony?
For Christchurch yes. For North Canterbury maybe. For areas south of Christchurch probably not, as the airflow direction will not enable such perfect orographic enhancement. But then with this much water on the ground and in the rivers it doesn't take as much rain to create as much havoc...
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by Razor »

TonyT wrote: Sun 30/05/2021 16:36
Bradley wrote: Sun 30/05/2021 15:08 Looks like the end of the NE rain coming?
The pivot point between the NE flow and the SE flow is starting to establish itself around Christchurch. Kinda like half time in the game. Pretty intense first half saw a lot of action. Will the second half live up to the pre-match speculation?
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by Chris W »

Got out for a wander around the village, a couple of squally downpours but the rain gear did its job. Benefits of living on a hill, all draining well though there was a little soil getting washed down the gutter on Jacksons Road. No flooding lower down but didn't check the tunnel roundabout which can flood a little.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by Dean. »

Ashburton river now at 1400 cumecs up from 800 this morning when I posted the earlier photo.This is getting bad we may end up evacuating overnight
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by darcyplumb »

Dean. wrote: Sun 30/05/2021 17:00 Ashburton river now at 1400 cumecs up from 800 this morning when I posted the earlier photo.This is getting bad we may end up evacuating overnight
We have been told to prepare to evacuate in Netherby and Allenton. I’ve heard from the mayor that the stop banks at the state highway one bridge will hold close to 2000 cumecs. The main concern is the stop banks at the top of Allenton as they’re just about to be breached.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by snowchaser01 »

We are all going to remember this event for a long time. Crazy numbers and potentially just half way through for some.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by Orion »

Scroll down this page for a map showing the potential flooding area in Ashburton:

https://www.ashburtondc.govt.nz/news/no ... nt-updates
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021

Unread post by Razor »

I'm at a loss to understand where the wind is, mostly calm here all day. Don't know if thars a good thing or not!
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