Mid August West Coast/ Nelson/ North Island flooding & record warmth

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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by Razor »

Nev wrote: Wed 17/08/2022 13:55 Currently 22.7C at Culverden according to MS...
Can beleive that, bright and mild here in ChCh now too, 18 degrees
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by Richard »

Nev wrote: Wed 17/08/2022 13:55 Currently 22.7C at Culverden according to MS...
Managed to reach 21.9deg here
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by Richard »

NIWA Waiau CWS was on 23.9deg, but I dont think its totally accurate given it location near buildings and concrete pathways
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by darcyplumb »

Big problems now developing in the Nelson Tasman region. State of emergency declared there too.
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by darcyplumb »

Nelson Region now under a red warning
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by NZ Thunderstorm Soc »

asuth wrote: Wed 17/08/2022 10:56 We are in Nelson and it has been raining heavily all morning. Our lawn is a lake and there is already surface flooding around the city. With another 300+mm or rain still to come over the next few days according to many models, I am baffled as to why Nelson/Tasman hasn’t been issued a red warning.
Yes a RED warning has been issued in your region now.
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by Awhituobs »

the latest satellite image is scary
lots of rain heading for the upper North Island now
and still more to come for areas that have already had heaps
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by spwill »

A windy night here and we are fairly sheltered to the NE at my place, light to mod rain, currently 16C, dew point 15C.
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by Awhituobs »

we are relatively sheltered from the NE wind here but I hear from locals who arent that it was bad
the models show it could strengthen again this afternoon
I see that the Waikato is warmer than Auckland area currently
so there must be a small Fohn effect downwind of the coromandel range (0.5c)
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by David »

20mm of light to moderate rain so far. Really don’t see 100mm+ occurring but let’s see
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by Awhituobs »

Really don’t see 100mm+ occurring but let’s see
note that is for the entire rain period, i.,e 24 hours still to go
and the rain radar shows still plenty of more rain moving south
the temperature is increasing, so that means heavy rain potential
so I suspect this afternoon /tonight it will get really going
(actually heavier here now , and across the Auckland area too)
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by Nev »

Just 12mm so far in my manual gauge. NE winds have been relentless here though. I think Tiritiri has been gusting to 100 km/h.

Aug Tmin records trumped again for the 24 hrs to 9am this morn at Auckland Aero, Mangere and Whangarei City....
https://twitter.com/NiwaWeather/status/ ... PGoKYrAAAA
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by harleyb »

Here's a comparison of the flooding on Avon Tce in Nelson with a Google Street view of the same place under normal conditions. Holy hell.
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by darcyplumb »

harleyb wrote: Thu 18/08/2022 10:56 Here's a comparison of the flooding on Avon Tce in Nelson with a Google Street view of the same place under normal conditions. Holy hell.

image.png
Holy moly that’s crazy! The rain is still thumping down there too with lots more to come.
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by spwill »

Exposed Keikeri, Northland is up to 98mm for the day so far, orographic enhancement of the rain there as well.
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by CbFan »

Gauge at Matauri Bay, (Northland) currently at 145mm for last 24Hrs (3pm-3pm), not so much intense rain rates, just relentless.
Touwai AWS currently matching it at 143mm/24Hr
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by Razor »

Aorere and Buckland Peaks gauges have tipped out over 600mm so far to lead the pack in Buller

600mm at Cropp and Tuke in Westland

Nelson/ Tasman 762 Anatoki, 540mm Takaka (Canaan)

Much more to come too it seems
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by NZ Thunderstorm Soc »

I think Buller and Westland have 'dodged the bullet" with this event with Nelson city copping the most of it?
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by Lawrence »

Low cloud / fog settling in here now.
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by jamie »

Now 24 Hours of continuous rain. Another 12 hours at least to go. However only 26mm in that time. Light but relentless rain.


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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by David »

Up to 40mm here for this event so far, mostly light rain since midday. New August station records today for highest daily minimum (15.7C) and highest daily mean (16.5C)
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by jamie »

17.8 degrees in the middle of the night in august with rain falling. Crazy!!!


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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by Richard »

jamie wrote: Fri 19/08/2022 02:25 17.8 degrees in the middle of the night in august with rain falling. Crazy!!!


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Crazy alright,its was19deg here at 2.30am, still winter :crazy:
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by Nev »

David wrote: Thu 18/08/2022 23:02 Up to 40mm here for this event so far, mostly light rain since midday. New August station records today for highest daily minimum (15.7C) and highest daily mean (16.5C)
I see Ricky's Grey Lynn PWS also had a Tmin of 15.6C yesterday and 15.0C the day before, beating it's previous highest Aug Tmin over the last 20 years of 14.3C in 2010. Today might also be Auckland and Whangarei's 3rd consecutive day of record Aug Tmins.

Just 26mm here for this event so far. MS had gusts to 96 km/h at Whangaparaoa yesterday arvo.

I see Kerikeri Aero also recorded 161mm yesterday, on top of 45mm the day before.
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Re: Mid August West Coast/ Nelson/ North Island flooding risk

Unread post by midgrove »

90mm at Woodbourne for this event so far, 50mm from PWS around Blenheim so we were right on the edge of the rain bands.
GFS predicting another 60mm over weekend here and yet another rain event on Thursday
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