Tasman low NI 15 -19 July

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Cyclone Tracy
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Re: Tasman low NI 15 -19 July

Unread post by Cyclone Tracy »

That Glenbervie gauge is now at 433mm for the thread.
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Re: Tasman low NI 15 -19 July

Unread post by cbm »

Goodness, it's still raining there. Daybreak is going to bring some scary sights.

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Re: Tasman low NI 15 -19 July

Unread post by NZstorm »

That Glenbervie site recorded 199mm in 6hours yesterday evening. Could that be a NZ 6 hour rainfall record? Perhaps not as the South Island West Coast can get that type of rainfall.

The Northland Regional Council rainguage in Whangarei recorded 90mm in 2 hours in yesterday evenings thunderstorm.
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Re: Tasman low NI 15 -19 July

Unread post by Awhituobs »

"Civil Defence welfare centres have been activated for people forced to leave homes in the Far North, as thunderstorms battered Northland and a tornado reportedly lurked offshore."
OMG the media are so bad
is that tornado still lurking this morning? (asking for a friend)
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Re: Tasman low NI 15 -19 July

Unread post by Cyclone Tracy »

Coromandel ranges has clocked 601mm for the thread so far.
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Re: Tasman low NI 15 -19 July

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i think they need a red warning now and a state of emergency put in place. yes reports of another spout,
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Re: Tasman low NI 15 -19 July

Unread post by Cyclone Tracy »

This beast hasn't quite finished yet with a parade of surface troughs with pluming mid level moisture above them. Cloud top near -60c off Whangarei at the moment.

The low is moving NE in the Tasman so should drag the system north and weaken which will produce another showery easterly flow into the Upper NI before its done in the next 24 hours.
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Re: Tasman low NI 15 -19 July

Unread post by spwill »

Reminds me of a Northland flooding event in March 2007. There was a slow moving line of training heavy showers/ thunderstorms in the Kerikeri area. 417mm fell in the hills near KeriKeri. Whangarei got 225mm from that event and Auckland city 82mm.
Shame the Auckland area missed out on the heavy rain with this event
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Re: Tasman low NI 15 -19 July

Unread post by tornado »

Yes. We missed out. On the heavy and thundery stuff. Shame. A chance next week for thunder though.
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Re: Tasman low NI 15 -19 July

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tornado wrote: Sat 18/07/2020 10:34 Yes. We missed out. On the heavy and thundery stuff. Shame. A chance next week for thunder though.
I see nz herald and stuff briefly talk about the tornadic waterspout. In their reports
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Re: Tasman low NI 15 -19 July

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Awhituobs wrote: Sat 18/07/2020 07:34 "Civil Defence welfare centres have been activated for people forced to leave homes in the Far North, as thunderstorms battered Northland and a tornado reportedly lurked offshore."
OMG the media are so bad
is that tornado still lurking this morning? (asking for a friend)

I know the media are always bad at things. at least they eased of the mini tornado thing a bit now. although they still use that from time to time. that waterspout might of dissipitated before it hit land. despite looking tornadic.
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Re: Tasman low NI 15 -19 July

Unread post by NZ Thunderstorm Soc »

Awhituobs wrote: Sat 18/07/2020 07:34 "
OMG the media are so bad
is that tornado still lurking this morning? (asking for a friend)
I notice that Newshub is not very good at reporting or highlighting weather events. :|
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Re: Tasman low NI 15 -19 July

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NZ Thunderstorm Soc wrote: Sat 18/07/2020 18:47
Awhituobs wrote: Sat 18/07/2020 07:34 "
OMG the media are so bad
is that tornado still lurking this morning? (asking for a friend)
I notice that Newshub is not very good at reporting or highlighting weather events. :|

yes. they are quite bad. they didnt even mention yesterdays tornado/waterspout. other media has mentioned it. was a significent storm for northland though. west coast style rain. the northland drought is done.
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Re: Tasman low NI 15 -19 July

Unread post by tornado »

Cyclone Tracy wrote: Thu 16/07/2020 10:19 Wind has moved from east to more ENE again here. Looks like the low in the Tasman wiggled slightly west in the last 2 hours causing the knock on effect.

Another 6mm with showers off the gulf brings the running total to 27mm
more than me i only have 17mm :(
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Re: Tasman low NI 15 -19 July

Unread post by NZ Thunderstorm Soc »

tornado wrote: Sat 18/07/2020 18:58

the northland drought is done.
Yes, Northland can get significant rainfalls. Can't think of the place.One place there has a record of the highest rainfall in one hour. The late RW could fill us on this.
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Re: Tasman low NI 15 -19 July

Unread post by David »

NZ Thunderstorm Soc wrote: Sat 18/07/2020 20:24 Yes, Northland can get significant rainfalls. Can't think of the place.One place there has a record of the highest rainfall in one hour. The late RW could fill us on this.
Could be this: https://hwe.niwa.co.nz/event/April_2000 ... nderstorms

Though the officially recognised figure is 109mm in an hour at Leigh, North Auckland.
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Re: Tasman low NI 15 -19 July

Unread post by jamie »

Remember thunderstorms are isolated so there are potentially still many areas in northland still suffering from drought.


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Re: Tasman low NI 15 -19 July

Unread post by Awhituobs »

at times the rain was widespread
so all of Northland has had good rain
but yeah the heaviest downpours were in lines
https://niwa.co.nz/static/climate/month ... n.png?1234
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Re: Tasman low NI 15 -19 July

Unread post by Cyclone Tracy »

The low has given the top end of Northland a backhander on the way out today with some fairly robust storms on that last trough.

Locally, 34mm for the thread. A fascinating synoptic scale Tasman gyre that completely fooled models and forecasters in real time over 48 hours on the 16 & 17th. Unfortunately, infrastructure damage will be extensive.
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Re: Tasman low NI 15 -19 July

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Re: Tasman low NI 15 -19 July

Unread post by Awhituobs »

crazy
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Re: Tasman low NI 15 -19 July

Unread post by NZ Thunderstorm Soc »

Normal.
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Re: Tasman low NI 15 -19 July

Unread post by Awhituobs »

no, not normal
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Re: Tasman low NI 15 -19 July

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man significent event for northland.
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