Possible "Bomb" cyclogenesis - Jan 18-20

Archive of NZ Weather & Climate
Forum rules
These topics are a read-only archive and may be subject to out-of-date information.

For today's weather discussion head to: New Zealand Weather & Climate
Bradley
Posts: 1519
Joined: Wed 01/05/2013 21:06
Location: Christchurch
Has thanked: 143 times
Been thanked: 269 times

Re: Possible "Bomb" cyclogenesis - Jan 18-20

Unread post by Bradley »

TonyT wrote:
Razor wrote:It was quite amusing to hear on several sources of media yesterday the rapid backtracking on the "Weather Bomb" naming convention. It was very refreshing to hear the correct information being disseminated in a number of places. Particular plaudit to Radio Live especially Alison Mau who was at pains to have the concept of explosive cyclogenesis/ bombing lows PROPERLY explained and the overused "weather bomb" phrase well and truly shelved.

I think this came about from the well worded Metservice facebook post on Monday.

Now lets see if mainstream media can grasp gust fronts, tornadoes, dust devils and microbursts... and forget the with mini along the way :-w
Unfortunately today's discussion of hurricane force gusts has somewhat undermined this worthy aspiration...
They will nearly always use the wrong terminology if they think the public understands it better then the technical term, I only heard the media last week talking about "tidal waves" after an undersea earthquake :lol:
User avatar
Nev
Moderator
Posts: 6229
Joined: Tue 07/03/2006 15:24
Location: Waiheke Island, Hauraki Gulf
Has thanked: 474 times
Been thanked: 1073 times

Re: Possible "Bomb" cyclogenesis - Jan 18-20

Unread post by Nev »

Razor wrote:I think this came about from the well worded Metservice facebook post on Monday.
It was more likely based on the earlier Press Release below, which was also posted on MS's website news page (although that doesn't appear to be working atm).

''Bomb' Low brings Wind, Rain & Cold' - Scoop

Unfortuantely it doesn't fully explain what that 'bomb' criteria is, nor does the referred 2012 blog… :-k

'The Bomb' - MetService Blog
User avatar
Thunder081
Posts: 469
Joined: Wed 22/08/2012 00:10
Location: Christchurch
Has thanked: 140 times
Been thanked: 464 times

Re: Possible "Bomb" cyclogenesis - Jan 18-20

Unread post by Thunder081 »

Some wind gust obs here

Top of the Rimutaka hill road
rimutaka summit 24h.PNG
Mt Kaukau
Mt Kaukau 24h.PNG
You do not have the required permissions to view the files attached to this post.
Wellington southerly front timelapse: www.youtube.com/watch?v=MBl3hsuIg2Q
User avatar
NZstorm
Posts: 11333
Joined: Mon 10/03/2003 19:38
Location: Grey Lynn, Auckland
Has thanked: 342 times
Been thanked: 361 times

Re: Possible "Bomb" cyclogenesis - Jan 18-20

Unread post by NZstorm »

Why bother with the term 'bomb'. The system was not untypical apart from the time of year i guess.

As for hurricane force gusts, its impossible to get such a thing but the media have got worse over the years.
Orion
Posts: 4000
Joined: Sun 08/08/2010 16:49
Location: Ashburton, Mid-Canterbury, 110m asl.
Has thanked: 1377 times
Been thanked: 332 times

Re: Possible "Bomb" cyclogenesis - Jan 18-20

Unread post by Orion »

Manukau heads obs wrote:WSW gales developing in coastal otago now
Report here:
https://www.odt.co.nz/regions/havoc-wea ... hits-south

"...The strongest winds gusts in Otago, of 135kmh, were in Nugget Point, but potentially damaging wind gusts were hitting the rest of the region, with 113kmh gusts at Swampy Summit, near Dunedin, and 96kmh gusts at Dunedin Airport..." - sounds nasty down there.
User avatar
Nev
Moderator
Posts: 6229
Joined: Tue 07/03/2006 15:24
Location: Waiheke Island, Hauraki Gulf
Has thanked: 474 times
Been thanked: 1073 times

Re: Possible "Bomb" cyclogenesis - Jan 18-20

Unread post by Nev »

NZstorm wrote:Why bother with the term 'bomb'. The system was not untypical apart from the time of year i guess.


The last true 'bomb' low to affect NZ was around March 3, 2012, so fairly 'untypical' I'd have thought…
Manukau heads obs
Posts: 12305
Joined: Mon 10/03/2003 16:30
Location: West Coast Road, Manukau Peninsula, North Island
Has thanked: 0
Been thanked: 0
Contact:

Re: Possible "Bomb" cyclogenesis - Jan 18-20

Unread post by Manukau heads obs »

We driving north through south Waikato...Good rain falling. Very thick..low level..dark...rain is heavier than the rain radar suggests .which must be beaming over the top.Good rain for the farms
Image
Brian Hamilton, weather enthusiast. My weather dataEmail: [email protected]
User avatar
David
Posts: 7587
Joined: Sat 18/08/2007 21:02
Location: Howick, Auckland
Has thanked: 416 times
Been thanked: 832 times
Contact:

Re: Possible "Bomb" cyclogenesis - Jan 18-20

Unread post by David »

Just 4mm rain in Howick. And it's almost 10 degrees colder than this time yesterday!
Image
einzack
Posts: 401
Joined: Sun 12/02/2012 10:21
Location: Rolleston, Canterbury
Has thanked: 5 times
Been thanked: 44 times

Re: Possible "Bomb" cyclogenesis - Jan 18-20

Unread post by einzack »

Orion wrote:
Manukau heads obs wrote:WSW gales developing in coastal otago now
Report here:
https://www.odt.co.nz/regions/havoc-wea ... hits-south

"...The strongest winds gusts in Otago, of 135kmh, were in Nugget Point, but potentially damaging wind gusts were hitting the rest of the region, with 113kmh gusts at Swampy Summit, near Dunedin, and 96kmh gusts at Dunedin Airport..." - sounds nasty down there.
We just drove from Kurow to Waikouaiti and there was signs of significant winds at various points. The wind around Duntroon were very very strong - luckily I was running with it at my back so it helped a lot!
Then towards Oamaru a lot of tree and branches down, likewise towards Hampden/Moeraki areas, which makes sense with the 130km/hr quoted from the ODT. Wind at home is not that strong at all at the moment, and my weather station maxed out at 70km/hr at 9:42 am. My station doesn't record wind well, so actual gusts would have been higher than that, but that's the 2nd highest I've recorded in the 14months that we've been back here.
NZ Thunderstorm Soc
Posts: 18489
Joined: Wed 12/03/2003 22:08
Location: Raukapuka Geraldine
Has thanked: 1769 times
Been thanked: 1412 times

Re: Possible "Bomb" cyclogenesis - Jan 18-20

Unread post by NZ Thunderstorm Soc »

Manukau heads obs wrote:but you know as well as I do that NWers in the canterbury plains are a fickle thing
sometimes the wind pressure works to create wind other times the pressure release is somewhere else (e.g banks peninsular or futher inland in the gorges etc)...its just how it all works out...not easy to predict
I agree with you on this. It is safe to put out a general warning for all areas in an area where high winds are forecasted. Here, there wasn't much wind, well, the ENE persisted well into the afternoon then the occasional north or NW came through and at times it was calm. The real influence of the NW was from about 6am this morning until the SW came through around 2pm, with similar wind strengths.
JohnGaul
NZThS
Manukau heads obs
Posts: 12305
Joined: Mon 10/03/2003 16:30
Location: West Coast Road, Manukau Peninsula, North Island
Has thanked: 0
Been thanked: 0
Contact:

Re: Possible "Bomb" cyclogenesis - Jan 18-20

Unread post by Manukau heads obs »

looks like alot of damage (flooding/slips) in the Westport area etc and wind damage in Otago (and southern NI)
when watching the news..all spots that had warnings in place
not your typical summer weather pattern (more typical of August)
Image
Brian Hamilton, weather enthusiast. My weather dataEmail: [email protected]
NZ Thunderstorm Soc
Posts: 18489
Joined: Wed 12/03/2003 22:08
Location: Raukapuka Geraldine
Has thanked: 1769 times
Been thanked: 1412 times

Re: Possible "Bomb" cyclogenesis - Jan 18-20

Unread post by NZ Thunderstorm Soc »

Manukau heads obs wrote: not your typical summer weather pattern (more typical of August)

Yes, more so.
Not so much "Climate Change" but "Seasonal change" with seasons running into each other, it seems to be?
JohnGaul
NZThS
Manukau heads obs
Posts: 12305
Joined: Mon 10/03/2003 16:30
Location: West Coast Road, Manukau Peninsula, North Island
Has thanked: 0
Been thanked: 0
Contact:

Re: Possible "Bomb" cyclogenesis - Jan 18-20

Unread post by Manukau heads obs »

It will be related to climate change
Where stuck weather patterns are becoming more frequent around the world
Image
Brian Hamilton, weather enthusiast. My weather dataEmail: [email protected]
User avatar
NZstorm
Posts: 11333
Joined: Mon 10/03/2003 19:38
Location: Grey Lynn, Auckland
Has thanked: 342 times
Been thanked: 361 times

Re: Possible "Bomb" cyclogenesis - Jan 18-20

Unread post by NZstorm »

I agree with Brian that this current pattern could be climate change.
NZ Thunderstorm Soc
Posts: 18489
Joined: Wed 12/03/2003 22:08
Location: Raukapuka Geraldine
Has thanked: 1769 times
Been thanked: 1412 times

Re: Possible "Bomb" cyclogenesis - Jan 18-20

Unread post by NZ Thunderstorm Soc »

Nev wrote: which was also posted on MS's website news page (although that doesn't appear to be working atm).
Sorry but not on topic, I have noticed this not working.
Maybe it's a scheme to get you to subscribe to their emails. :p
Last edited by Nev on Thu 19/01/2017 21:42, edited 1 time in total.
Reason: Fixed quote box
JohnGaul
NZThS
User avatar
Nev
Moderator
Posts: 6229
Joined: Tue 07/03/2006 15:24
Location: Waiheke Island, Hauraki Gulf
Has thanked: 474 times
Been thanked: 1073 times

Re: Possible "Bomb" cyclogenesis - Jan 18-20

Unread post by Nev »

I've put together a list of some of the higher gusts recorded yesterday…

Code: Select all

Jan 19 2016 Max Gusts (km/h)

172  near Mt Hutt
157  Cape Turnagain
154  Rimutaka Hill Rd summit
148  Mt Kaukau
139  Barring Head
137  Rimutaka Hill Road
135  Nugget Point
132  Akitio
124  Le Bons Bay
120  Kelburn, Wellington
117  Wellington Aero
117  Cape Campbell
117  Waiouru
113  Brothers Island
100  Invercargill Aero
98  Blenheim Aero
98  Sugarloaf
96  Dunedin Aero
96  Roxburgh
94  Oamaru Aero
94  Birchwood
93  Westport
93  Mana Island
93  Lower Hutt
91  Kaikoura
91  Stratford Mount
89  Nelson Aero
89  Fairlie
89  Gore
Also for comparison, below are NIWA summaries of the 4 previous weather-bombs to have affected NZ…

2012: Mar 03 - North Island Weather Bomb
2008: Jul 26 - North Island Weather Bomb
2002: Jun 18 - Upper North Island Weather Bomb
2000: Oct 11 - New Zealand Weather Bomb
Orion
Posts: 4000
Joined: Sun 08/08/2010 16:49
Location: Ashburton, Mid-Canterbury, 110m asl.
Has thanked: 1377 times
Been thanked: 332 times

Re: Possible "Bomb" cyclogenesis - Jan 18-20

Unread post by Orion »

User avatar
Thunder081
Posts: 469
Joined: Wed 22/08/2012 00:10
Location: Christchurch
Has thanked: 140 times
Been thanked: 464 times

Re: Possible "Bomb" cyclogenesis - Jan 18-20

Unread post by Thunder081 »

Nev wrote:I've put together a list of some of the higher gusts recorded yesterday…

Code: Select all

Jan 19 2016 Max Gusts (km/h)

172  near Mt Hutt
157  Cape Turnagain
154  Rimutaka Hill Rd summit
148  Mt Kaukau
139  Barring Head
137  Rimutaka Hill Road
135  Nugget Point
132  Akitio
124  Le Bons Bay
120  Kelburn, Wellington
117  Wellington Aero
117  Cape Campbell
117  Waiouru
113  Brothers Island
100  Invercargill Aero
98  Blenheim Aero
98  Sugarloaf
96  Dunedin Aero
96  Roxburgh
94  Oamaru Aero
94  Birchwood
93  Westport
93  Mana Island
93  Lower Hutt
91  Kaikoura
91  Stratford Mount
89  Nelson Aero
89  Fairlie
89  Gore
Also for comparison, below are NIWA summaries of the 4 previous weather-bombs to have affected NZ…

2012: Mar 03 - North Island Weather Bomb
2008: Jul 26 - North Island Weather Bomb
2002: Jun 18 - Upper North Island Weather Bomb
2000: Oct 11 - New Zealand Weather Bomb
194km/h gust recorded in the Tararuas:

http://graphs.gw.govt.nz/?siteName=Tauh ... %20(km/hr)
Wellington southerly front timelapse: www.youtube.com/watch?v=MBl3hsuIg2Q
Locked