Possible Storms Upper North Island - 28th Sep

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These topics are a read-only archive and may be subject to out-of-date information.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
User avatar
Tornado Tim
Moderator
Posts: 4894
Joined: Sun 19/10/2008 17:17
Location: Raglan, Waikato / Hillcrest, Hamilton
Has thanked: 91 times
Been thanked: 174 times
Contact:

Possible Storms Upper North Island - 28th Sep

Unread post by Tornado Tim »

Metservice wrote:During the afternoon, surface temperatures will continue to rise and sea breezes are likely to develop about several coastal areas of the North Island. This should elevate the risk of thunderstorms for much of the north of the North Island.

There is a broad low risk of thunderstorms during the afternoon and evening for the North Island from inland Taranaki, Wanganui, northern Manawatu and Hawkes Bay northwards, with activity in southwestern areas more likely during the afternoon. The risk increases to moderate for eastern Northland, Auckland, the Coromandel Peninsula, Waikato, Taupo, Bay of Plenty, Gisborne and northern Hawkes Bay. If these thunderstorms occur they are likely to be accompanied by localised heavy rain with intensities of 10 to 25mm per hour and hail of 5 to 15mm diameter. Although the thunderstorm activity should ease in most places during the evening around East Cape the moderate risk extends until midnight.

No other areas of severe convection or thunderstorms are expected.
Instability may be a little weak depending on the SFC Moisture..... Hopefully we might get something on a Sea-breeze front.
You do not have the required permissions to view the files attached to this post.
NZAPStrike.net - NZ Aus Pacific Strike Network
User avatar
Tornado Tim
Moderator
Posts: 4894
Joined: Sun 19/10/2008 17:17
Location: Raglan, Waikato / Hillcrest, Hamilton
Has thanked: 91 times
Been thanked: 174 times
Contact:

Re: Possible Storms Upper North Island - 28th Sep

Unread post by Tornado Tim »

Blimey, Storms initiating now, this late! Just heard a good rumble of Thunder just now :)
You do not have the required permissions to view the files attached to this post.
NZAPStrike.net - NZ Aus Pacific Strike Network
jamie
Posts: 5844
Joined: Fri 25/02/2011 21:35
Location: Hamilton NZ
Has thanked: 22 times
Been thanked: 251 times
Contact:

Possible Storms Upper North Island - 28th Sep

Unread post by jamie »

Didn't get woken by the thunder. Got woken by heavy rain now tho.

Radar shows Brian right on the edge of a massive red blob. on the radar.
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 Storms Upper North Island - 28th Sep

Unread post by NZstorm »

The set up is crossing Waikato/Auckland a bit early and will be east of the area in the afternoon.

Could be good for hail in Coromandel/Bay of Plenty/Gisborne if they get enough heating over there.

500mb temperature chart for the record.
You do not have the required permissions to view the files attached to this post.
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 Storms Upper North Island - 28th Sep

Unread post by Manukau heads obs »

15mm here overnight that i did not expect
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 Storms Upper North Island - 28th Sep

Unread post by NZstorm »

0.4mm only in Grey Lynn.


500mb vorticity chart shows the vortex well. 00Z today.
You do not have the required permissions to view the files attached to this post.
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 Storms Upper North Island - 28th Sep

Unread post by Manukau heads obs »

I notice a sporadic glitch on rain radar too
line down west coast
heavy shower line that we got to move onto the city this morning?
Image
Brian Hamilton, weather enthusiast. My weather dataEmail: [email protected]
User avatar
David
Posts: 7149
Joined: Sat 18/08/2007 21:02
Location: Howick, Auckland
Has thanked: 345 times
Been thanked: 533 times
Contact:

Re: Possible Storms Upper North Island - 28th Sep

Unread post by David »

Manukau heads obs wrote:I notice a sporadic glitch on rain radar too
line down west coast
heavy shower line that we got to move onto the city this morning?
That glitch has been there on and off for at least several days now :-k
Image
User avatar
Tornado Tim
Moderator
Posts: 4894
Joined: Sun 19/10/2008 17:17
Location: Raglan, Waikato / Hillcrest, Hamilton
Has thanked: 91 times
Been thanked: 174 times
Contact:

Re: Possible Storms Upper North Island - 28th Sep

Unread post by Tornado Tim »

Thunderstorm Outlook very much the same from last night:
This afternoon, as surface temperatures rise, sea breezes are likely to develop about coastal areas of the North Island. This should elevate the risk of thunderstorms for much of the north of the North Island.

There is a broad low risk of thunderstorms during the afternoon and evening for the North Island from inland Taranaki, Wanganui, northern Manawatu and Hawkes Bay northwards, with activity in southwestern areas more likely during the afternoon. The risk increases to moderate for Northland, Auckland, the Coromandel Peninsula, Waikato, Taupo, Bay of Plenty, Gisborne and northern Hawkes Bay. Any thunderstorms that occur are likely to be accompanied by localised heavy rain with intensities of 10 to 25mm per hour and hail of 5 to 15mm diameter. Although the thunderstorm activity should ease in most places this evening, around East Cape the moderate risk continues until midnight.

No other areas of severe convection or thunderstorms are expected.
You do not have the required permissions to view the files attached to this post.
NZAPStrike.net - NZ Aus Pacific Strike Network
spwill
Posts: 9354
Joined: Sun 29/06/2003 22:39
Location: Mt Eden Auckland
Has thanked: 432 times
Been thanked: 526 times

Re: Possible Storms Upper North Island - 28th Sep

Unread post by spwill »

There was some thunderstorm activity overnight west and east of Auckland over the warmer sea.
Coromandel/BOP might be the area for a storm this afternoon
User avatar
Tornado Tim
Moderator
Posts: 4894
Joined: Sun 19/10/2008 17:17
Location: Raglan, Waikato / Hillcrest, Hamilton
Has thanked: 91 times
Been thanked: 174 times
Contact:

Re: Possible Storms Upper North Island - 28th Sep

Unread post by Tornado Tim »

Nice crisp cumulus congestus going up around Raglan, looking good :)
NZAPStrike.net - NZ Aus Pacific Strike Network
User avatar
shovelopikis
Posts: 237
Joined: Mon 03/06/2013 09:37
Location: Taranaki
Has thanked: 0
Been thanked: 6 times

Re: Possible Storms Upper North Island - 28th Sep

Unread post by shovelopikis »

Massive clouds here over pureroas , getting odd showers from them,awesome bases, going for drive later this arvo over waikato, will be interesting.
spwill
Posts: 9354
Joined: Sun 29/06/2003 22:39
Location: Mt Eden Auckland
Has thanked: 432 times
Been thanked: 526 times

Re: Possible Storms Upper North Island - 28th Sep

Unread post by spwill »

Pea size hail here at Pokeno, lightning/thunder also.
cbm
Posts: 929
Joined: Fri 17/10/2008 08:50
Location: Cambridge, Waikato NZ
Has thanked: 11 times
Been thanked: 167 times

Unread post by cbm »

Over 6C difference between Ruakura and Ham Airport stations ATM. 17.1 verses 10.9
User avatar
Tornado Tim
Moderator
Posts: 4894
Joined: Sun 19/10/2008 17:17
Location: Raglan, Waikato / Hillcrest, Hamilton
Has thanked: 91 times
Been thanked: 174 times
Contact:

Re:

Unread post by Tornado Tim »

cbm wrote:Over 6C difference between Ruakura and Ham Airport stations ATM. 17.1 verses 10.9
Yea the remaints of a shower passing by, my station is half way between Ruakura and Hamilton AP in terms of location and temp. 14.9.
NZAPStrike.net - NZ Aus Pacific Strike Network
cbm
Posts: 929
Joined: Fri 17/10/2008 08:50
Location: Cambridge, Waikato NZ
Has thanked: 11 times
Been thanked: 167 times

Unread post by cbm »

Does cooler air come down in the shower as a downdraft or does the rain cool the surface air? It certainly seems to be a strong effect this time of year.
jamie
Posts: 5844
Joined: Fri 25/02/2011 21:35
Location: Hamilton NZ
Has thanked: 22 times
Been thanked: 251 times
Contact:

Possible Storms Upper North Island - 28th Sep

Unread post by jamie »

Some decent towers going up to my North, East and south east
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 Storms Upper North Island - 28th Sep

Unread post by Manukau heads obs »

report of lots of hail just north of taupo .could see that cb from here 1 pmish
Image
Brian Hamilton, weather enthusiast. My weather dataEmail: [email protected]
Razor
Moderator
Posts: 4725
Joined: Fri 10/02/2006 15:14
Location: Halswell, Christchurch
Has thanked: 550 times
Been thanked: 571 times

Re: Possible Storms Upper North Island - 28th Sep

Unread post by Razor »

From the NZ Herald website...sleety showers? Oh my word http://www.nzherald.co.nz/nz/news/artic ... d=11520218

While the ground temperature at the city's airport is a relatively mild 14C, the clouds hanging over the region are packing some hail, MetService meteorologist Lisa Murray said.

"It's a case of 'do they get to the ground before they melt?'"
Early this afternoon hail stones have been reported in the city.


Ms Murray said the day would bring "sleety showers" and there was a moderate risk of thunder storms from a trough moving over Auckland.
Christchurch Rocks
User avatar
shovelopikis
Posts: 237
Joined: Mon 03/06/2013 09:37
Location: Taranaki
Has thanked: 0
Been thanked: 6 times

Re: Possible Storms Upper North Island - 28th Sep

Unread post by shovelopikis »

Pea size hail 5km west taupo, been covering the roads for a good 10mins so far.
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 Storms Upper North Island - 28th Sep

Unread post by Manukau heads obs »

also a report of hail snells beach
Image
Brian Hamilton, weather enthusiast. My weather dataEmail: [email protected]
User avatar
shovelopikis
Posts: 237
Joined: Mon 03/06/2013 09:37
Location: Taranaki
Has thanked: 0
Been thanked: 6 times

Re: Possible Storms Upper North Island - 28th Sep

Unread post by shovelopikis »

South waikato ones have been very slow moving...constant loud bangs here with odd flashes, more hail around tokoroa
spwill
Posts: 9354
Joined: Sun 29/06/2003 22:39
Location: Mt Eden Auckland
Has thanked: 432 times
Been thanked: 526 times

Re: Possible Storms Upper North Island - 28th Sep

Unread post by spwill »

Some hail in Mt Eden mid afternoon. Some nice cloud build ups around.
The thunderstorm activity today has been isolated.
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 Storms Upper North Island - 28th Sep

Unread post by NZstorm »

A brief shower in Freemans Bay. A lack of instability over Auckland today.
spwill
Posts: 9354
Joined: Sun 29/06/2003 22:39
Location: Mt Eden Auckland
Has thanked: 432 times
Been thanked: 526 times

Re: Possible Storms Upper North Island - 28th Sep

Unread post by spwill »

Photo of a cumulus line near the Bombay hills ( produced a brief thunderstorm with pea size hail) and cumulus over east Auckland
You do not have the required permissions to view the files attached to this post.
Locked