Cyclone Gabrielle impacts on NZ - Feb 12-16

Weather reports, prognostics, questions and discussion. Climate diagnostics, drivers, and outlooks. Weather stations and websites.
User avatar
Nev
Moderator
Posts: 6216
Joined: Tue 07/03/2006 15:24
Location: Waiheke Island, Hauraki Gulf
Has thanked: 468 times
Been thanked: 1064 times

Re: Cyclone Gabrielle impacts on NZ - Feb 12-16

Unread post by Nev »

David wrote: Sun 26/02/2023 14:44 Some incredible numbers reported by a Davis station in Hawkes Bay:
https://www.nzherald.co.nz/nz/hawkes-ba ... VGVQXP4VE/
A little too incredible I suspect. While I don't doubt the actual numbers, I do doubt the reported timeframes.

Significant rain fell on both Monday (13th) and Tuesday (14th), so I suspect the reporter meant that 643.6mm fell in 48 hours (not 24 hours)? The highest Hawke's Bay Regional Council site that I can find for the event in that area was 554.0mm at Glengarry (243.5mm on the 13th and 294.5mm on the 14th).

I also think the reporter has confused the rain-rate of '250mm per hour' with what actually fell in that hour, which was probably only a fraction of that going by Council gauges?

Edit: 643.6mm over 24 hrs might be possible if what they meant by 'Tuesday' was actually from say 9am on Monday to 9am on Tuesday?
Very confusing article nonetheless... :-k
NZ Thunderstorm Soc
Posts: 18488
Joined: Wed 12/03/2003 22:08
Location: Raukapuka Geraldine
Has thanked: 1769 times
Been thanked: 1412 times

Re: Cyclone Gabrielle impacts on NZ - Feb 12-16

Unread post by NZ Thunderstorm Soc »

Richard wrote: Sun 26/02/2023 18:06 The more photos/videos I see the more I am noticing is that it is not just pine slash but instead there huge amounts of crack willow. If you think about it, the rivers banks around NZ were extensively plants 40-50 years ago, much of these trees are getting old and far more prone to being ripped out of the ground when a major rainfall event by the pine slash pushing up against it , its a double whammy
Good point there, Richard
JohnGaul
NZThS
Blowy
Posts: 96
Joined: Tue 10/03/2015 12:21
Location: Hawkes Bay
Has thanked: 55 times
Been thanked: 25 times

Re: Cyclone Gabrielle impacts on NZ - Feb 12-16

Unread post by Blowy »

A lot of recent riparian plantings, all natives, funded by the Regional Council, also got ripped dipped and tipped out - green logic anyone?
User avatar
Richard
Posts: 8369
Joined: Tue 14/07/2009 07:32
Location: Medbury, Inland North Canterbury
Has thanked: 1656 times
Been thanked: 800 times

Re: Cyclone Gabrielle impacts on NZ - Feb 12-16

Unread post by Richard »

You cant beat the crack willow for river bank holding ability which natives dont do. Rivers that are at the greatest risk of massive flows should have the willows clear felled every 20 years to keep the regrowth young and flexible, this would increase the root mass as well.
User avatar
Richard
Posts: 8369
Joined: Tue 14/07/2009 07:32
Location: Medbury, Inland North Canterbury
Has thanked: 1656 times
Been thanked: 800 times

Re: Cyclone Gabrielle impacts on NZ - Feb 12-16

Unread post by Richard »

In a article from Ian Wishart in which he claims to have found records showing not only missing accounts of historical cyclones but also shows lower air pressures than what was recorded with Gabrielle.
Climate-of-Fear-Report-final-by-Ian-Wishart.pdf
You do not have the required permissions to view the files attached to this post.
BeaconHill
Posts: 239
Joined: Sat 16/05/2009 21:10
Location: Strathmore/Seatoun (on the ridgeline), Wellington
Has thanked: 196 times
Been thanked: 344 times

Re: Cyclone Gabrielle impacts on NZ - Feb 12-16

Unread post by BeaconHill »

Aerial imagery of the flooding in the Hawkes Bay has been processed and released by LINZ. Astounding images!

https://data.linz.govt.nz/layer/112726- ... otos-2023/
6FCA40CC-53DE-4F53-8F42-1B15C2A25EE9.jpeg
You do not have the required permissions to view the files attached to this post.
James
Posts: 30
Joined: Mon 06/03/2017 07:58
Location: Havelock North
Has thanked: 0
Been thanked: 23 times

Re: Cyclone Gabrielle impacts on NZ - Feb 12-16

Unread post by James »

Post Reply