Tasman low and cold air collision September 7-9

tornado · Unread post by **tornado** » Mon 09/09/2019 11:28

think the risk for hail/thunder will be better from this afternoon according to radar and blitz

David · Unread post by **David** » Mon 09/09/2019 13:17

tornado wrote: ↑Mon 09/09/2019 11:28 think the risk for hail/thunder will be better from this afternoon according to radar and blitz

Starting to look interesting on radar. Got some daytime warming going too so hopefully that helps, 17C at the moment.

GraemeWi · Unread post by **GraemeWi** » Mon 09/09/2019 13:31

It's pretty hard to visually sight what is going on through the Aussie dust / smoke haze. Around midday there were some tcu off to the north, and some ac out to the south east visible from Albany. Still plenty of water on the ground from a downpour around 8:30 ish this morning

tornado · Unread post by **tornado** » Mon 09/09/2019 13:40

storm in whangarei could head down to auckland. im gonna keep a eye on the radars

Cyclone Tracy · Unread post by **Cyclone Tracy** » Mon 09/09/2019 13:51

Some cloud tops now around -50c near Warkworth.

tornado · Unread post by **tornado** » Mon 09/09/2019 14:02

Cyclone Tracy wrote: ↑Mon 09/09/2019 13:51 Some cloud tops now around -50c near Warkworth.

yes heading our way too

NZstorm · Unread post by **NZstorm** » Mon 09/09/2019 14:34

Static on the am band every 2-10 seconds. Skies very dark to NW.

Cyclone Tracy · Unread post by **Cyclone Tracy** » Mon 09/09/2019 14:34

Distant thunder to the north

tornado · Unread post by **tornado** » Mon 09/09/2019 14:36

thunderstorms coming from the north. second time

NZstorm · Unread post by **NZstorm** » Mon 09/09/2019 14:49

Lightning to NW with distant thunder.

tornado · Unread post by **tornado** » Mon 09/09/2019 14:50

I can hear thunder now

tornado · Unread post by **tornado** » Mon 09/09/2019 14:52

looks like another cell going into whangarei and it looks if its coming this way too.

tornado · Unread post by **tornado** » Mon 09/09/2019 15:13

it seemed to stop but im watching the storm st wwhangarei as that may head towards here

tornado · Unread post by **tornado** » Mon 09/09/2019 15:40

never mind more thunder and lightning. its just turned out to be isolated thunderstorms.

David · Unread post by **David** » Mon 09/09/2019 15:51

A shame it mostly fizzled out as it crossed the main central part of the region. Looks like it might be intensifying again in south Auckland now

tornado · Unread post by **tornado** » Mon 09/09/2019 15:54

David wrote: ↑Mon 09/09/2019 15:51 A shame it mostly fizzled out as it crossed the main central part of the region. Looks like it might be intensifying again in south Auckland now

yeah. Im still hearing the odd rumble and the odd flash

NZstorm · Unread post by **NZstorm** » Mon 09/09/2019 17:24

The sky was hazy again today. According to Weatherzone bushfire smoke has reached northern NZ.

That afternoon storm was very lightning active in the far west of the Auckland region but just a few strikes further east. I suppose with the surface NE that's not surprising. PWS along the west coast recorded up to 20mm from it. Just 4mm in Grey Lynn.

Nev · Unread post by **Nev** » Mon 09/09/2019 17:42

Can't say as I noticed much here, but yes, quite an active afternoon to the west and north of Akld going by Blitz…

Blitzortung NZ - 8 hrs to 5pm, Sep 09.png

tornado · Unread post by **tornado** » Mon 09/09/2019 18:29

great barrier island under a severe thunderstorm warning.

edit: warning removed

NZstorm · Unread post by **NZstorm** » Mon 09/09/2019 19:04

NIWA lightning strike chart to 4pm. Quite intense activity Helensville way this afternoon.

https://twitter.com/NiwaWeather/status/ ... 94/photo/1

Simon Culling · Unread post by **Simon Culling** » Mon 09/09/2019 21:13

Some quite large hailstones reported in Whangarei according to this press report in The New Zealand Herald. Theses stones look to be in the 30-40mm range:

https://www.nzherald.co.nz/nz/news/arti ... d=12266146

This story appears to refer to the afternoon of Monday 9th September.

David · Unread post by **David** » Tue 10/09/2019 06:16

Just over 200mm rainfall recorded at Pinnacles Coromandel overnight

NZstorm · Unread post by **NZstorm** » Tue 10/09/2019 06:44

Re large hail

There was some wind shear yesterday so very likely some cork screwing of the storm updraughts to get the larger hail and more intense lightning.

Awhituobs · Unread post by **Awhituobs** » Tue 10/09/2019 07:23

thought I would re join, have missed being able to be part of the conversations

especially interesting this SSW event

We had a great thunderstorm here yesterday afternoon
actually we have had lots here over the last few days (some real good ones at night too, real close lightning and thunder)
the rain can stop now though!! (and I see we have a more typical weather pattern for the next week after today, whew)
Brian

tornado · Unread post by **tornado** » Tue 10/09/2019 07:25

moderate risk for northland and most parts of auckland north of manukau. low risk south of manukau

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Tasman low and cold air collision September 7-9

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