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
I’m out for dinner not far from home in Sydenham. It’s been so heavy for the last 3 hours. I’m struggling to remember persistent rain like this in Christchurch in my lifetime.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
And yet 50km up the road in Amberley we have had virtually nothing for 3 hours, the boundary lying between the two locations. Mind you, we did get 75mm today prior to it stopping early afternoon.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
Crazy rain the last 3 hours here alright. Roads shutting left, right and centre. Up to 80mm now for the event with 24mm in the last 3 hours.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
We cracked the 200mm mark just before 4pm, for this event. Really flooded down here but it has seemed to off peaked here in our street.
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Last edited by NZ Thunderstorm Soc on Sun 30/05/2021 20:17, edited 1 time in total.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
State of Emergency now extended to include the whole of Canterbury. Meanwhile the moisture river keeps feeding into here with another 7mm in the last hour taking us to 87mm. Think its possible might crack the 100mm mark before midnight!
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
Latest water vapour image overlayed with 950 hPa winds and surface pressure readings. Vigorous flowing canal of mid level moisture is now moving in from south of the Chatham Islands. Air pressure on land obs suggests the next vortex in the parade is now just north of Pegasus Bay.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
I'm picking thats not looking like good news....Cyclone Tracy wrote: ↑Sun 30/05/2021 19:33 Latest water vapour image overlayed with 950 hPa winds and surface pressure readings. Vigorous flowing canal of mid level moisture is now moving in from south of the Chatham Islands. Air pressure on land obs suggests the next vortex in the parade is now just north of Pegasus Bay.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
The mothership low in the Tasman is moving NE towards Auckland and will drag this moisture feed into Canterbury during the night. This is a classic set up for a high moisture fed convergence zone. Lets hope not.Razor wrote: ↑Sun 30/05/2021 19:45I'm picking thats not looking like good news....Cyclone Tracy wrote: ↑Sun 30/05/2021 19:33 Latest water vapour image overlayed with 950 hPa winds and surface pressure readings. Vigorous flowing canal of mid level moisture is now moving in from south of the Chatham Islands. Air pressure on land obs suggests the next vortex in the parade is now just north of Pegasus Bay.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
Yes, what does this mean exactly CT? Anyone in particular in the firing line from that?Cyclone Tracy wrote: ↑Sun 30/05/2021 19:33 Latest water vapour image overlayed with 950 hPa winds and surface pressure readings. Vigorous flowing canal of mid level moisture is now moving in from south of the Chatham Islands. Air pressure on land obs suggests the next vortex in the parade is now just north of Pegasus Bay.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
Convergence zones appearing on the radar like this one in the last hour is what to watch out for. When they start moving more in a SE to NW direction and stall, this spells trouble. The high intensity areas of these zones should move northward during the night.Cantab03 wrote: ↑Sun 30/05/2021 19:54Yes, what does this mean exactly CT? Anyone in particular in the firing line from that?Cyclone Tracy wrote: ↑Sun 30/05/2021 19:33 Latest water vapour image overlayed with 950 hPa winds and surface pressure readings. Vigorous flowing canal of mid level moisture is now moving in from south of the Chatham Islands. Air pressure on land obs suggests the next vortex in the parade is now just north of Pegasus Bay.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
The river was close to the bridge on nightfall
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
Thanks for that info CT. Finally stopped raining here and a clearance. Will see how and if it comes back in overnight.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
Rain radar showing rapid clearance?
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
Yes expected but then models suggest a SW influence and high moisture out put heading north and back into mid and north Canterbury overnight and into tomorrow.
It will start to clear off in otago and south Canterbury.
Definitely not over! Hopefully the rivers in ashburton can hold up with the next band moving in.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
Yeah. Rain easing off now and water slowly draining away.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
wouldnt have been better to do the evacuation earlier, when it was daylight?* Residents in the Waimakariri District, in the Swannanoa/Ohoka area have been asked to evacuate immediately as river stopbanks are at risk of failing.
* Residents living near Eyre River are most at risk.
* Civil Defence sent an emergency alert message to mobile phones in affected areas around 8.50pm.
now they have to drive on flooded roads in the dark?
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
Good to see less 'blue' on the radar this evening! Although still far from over
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
All over red rover. The radar shows it easing.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
Drove to Spreydon and back tonight (for a reason) and just a few patches of surface flooding, with the Heathcote within its banks at both 7pm and 8:30pm. Hope that continues, though the rain did keep falling and occasionally heavily. Roads were quiet so obviously plenty of people staying put.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
Raining heavily in St Albans/Central Chch earlier in evening, but now just drizzling.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
Dont agree at all. I see this picking up again early hours of morning onwards into tomorrow.. infact models suggest the event going late into Monday night esp north Canterbury. Not over at all.
Mike
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
I agree but I think it will be more showery rather than constant rain.
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
I think there will be another period of constant rain early hours until around lunch time tomorrow before easing to showers afternoon. Showers may continue monday night. North Canterbury gets a dollop tomorrow afternoon/ night.NZ Thunderstorm Soc wrote: ↑Sun 30/05/2021 23:34 I agree but I think it will be more showery rather than constant rain.
Hope the flooding down your way is on the ease for you john.
Plenty to catch up on over another weather meeting at some point to
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
Coming back into rain again in Chch. Waiting for that wind still
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Re: Large Rain Event Canterbury and high altitude snow. 29-31st May 2021
Water gradually draining away as the rain is not constant as what it has been today.mikestormchaser wrote: ↑Sun 30/05/2021 23:54Hope the flooding down your way is on the ease for you john.NZ Thunderstorm Soc wrote: ↑Sun 30/05/2021 23:34 I agree but I think it will be more showery rather than constant rain.
Plenty to catch up on over another weather meeting at some point to
Talking to a Fulton and Hogan guy today, who was inspecting the street for flooding on behalf of the TDC, said that flooding around here was mainly because houses here were built in the 1950's with soakpits for drainage and that's why it floods in a weather event like this.
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