General September Weather

[cbm]

So much for the forecast cloudy periods, a second blue dome day for the weekend.

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[tornado]

this comming week auckland may get some thunderstorms. the squall line thats developing. i hope comes this way.

[Orion]

A glary red sunrise-reflection on a layer of low cloud here earlier, fading now to orange-yellow.
12.7°C.

[NZstorm]

this comming week auckland may get some thunderstorms. the squall line thats developing. i hope comes this way.

Tomorrows front over the North Island looks a lottery for squally thunder, a few spots will catch some.

[tornado]

yep heres the metservices thunderstorm risks for tommorow.


Valid to: Noon Tuesday 24 Sep 2019

Issued at: 9:14am Monday 23 Sep 2019

A front is expected to move east over the North Island Tuesday morning bringing a burst of heavy rain. There is a moderate risk of thunderstorms associated with this front from Waitomo north to Northland and also for Coromandel Peninsula and the Bay of Plenty. These storms may be accompanied by heavy rain, 10 to 25mm per hour. There is a low risk of thunderstorms in a broader area as indicated on the chart.

A trough is expected to bring showers to the west of the South Island. There is a low risk of thunderstorms in much of Fiordland and Westland as indicated on the chart.

No thunderstorms or significant convection expected elsewhere.

thunderstormOutlookImage-1.png

Valid to: Midnight Tuesday 24 Sep 2019

Issued at: 9:15am Monday 23 Sep 2019

The front moves east across the Bay of Plenty in the afternoon and there is a moderate risk of thunderstorms with heavy rain, 10 to 25mm per hour in the east of Coromandel, the Bay of Plenty and the far north of Gisborne.

A trough is expected to move north over the upper South Island in the afternoon and the North Island in the evening. There is a low risk of thunderstorms in the north of Westland, Buller and the far west of Nelson in the afternoon. There is also then a low risk of thunderstorms in the north of Canterbury and the east of Marlborough as indicated on the chart.

In the evening there is a low risk of thunderstorms in the west of Taranaki, Waitomo, Waikato and Auckland as indicated.

No thunderstorms or significant convection expected elsewhere.

thunderstormOutlookImage2.png

[TonyT]

I'd be looking out for mid to late afternoon thunderstorms or hail in Canterbury tomorrow.

[Razor]

Looks like lots of "critical SW" in the long range forecast. Southland, West coast and western NI coasts will have an especially vigorous couple of weeks coming up

[Richard]

Neat looking arch here in the Omihi area this morning.

IMG_20190923_113049.jpg

[NZ Thunderstorm Soc]

I'd be looking out for mid to late afternoon thunderstorms or hail in Canterbury tomorrow.

Yes. Let the 2019/2020 thunderstorm season commence.

[snowykiwi]

I'll be happy as long as the 2019/2020 thunderstorm season doesn't produce the long duration heavy intensity rain like that we had in Methven in December last year. The council drains stopped coping after 20 minutes and a lot of the businesses including mine had surface flooding through them.

[NZ Thunderstorm Soc]

I'll be happy as long as the 2019/2020 thunderstorm season doesn't produce the long duration heavy intensity rain like that we had in Methven in December last year. The council drains stopped coping after 20 minutes and a lot of the businesses including mine had surface flooding through them.

Yes. In saying this hoping no one gets affected by hail, cloudbursts etc, which is associated with the thunderstorms, but just to enjoy the enhancement that thunderstorm activity brings, ie lightning displays and cloud forms etc.

[Richard]

Yes, none damaging thunderstorms, thats what I like about where I am, no large hail and most storms come with light winds.

[Chris W]

MS seemed keen on a low risk today for mid Canterbury and same for North Canterbury tomorrow.

Pretty windy today in the usual places between Amberley and Chch. Nice and warm in town.

[NZstorm]

A few storms/hail look likely up the east of the South Island tomorrow afternoon with convergence and orographic lift being the triggers. Moisture is not great but 700mb temps are very cold at -11C so some mid level CAPE develops with afternoon heating.

[tornado]

uh do yo guys think there be thunder on wednesday for auckland cause metservice thinks on wednesday showers could turn thundery. Id say a low risk on wednesday. i give a moderate risk tommorow.

[NZstorm]

uh do yo guys think there be thunder on wednesday for auckland

Dewpoint is around 10C tomorrow and 500mb -25C so certainly a chance of isolated squally thunderstorms.

[David]

Nothing much here so far, bit of patchy light rain and light winds

[Awhituobs]

Gale NW winds here and squally rain

[David]

Gale NW winds here and squally rain

It's quite surprising sometimes the difference with the NW'er, while you were getting gusts to 87 km/h it was only gusting to 17 km/h over here.

[Awhituobs]

I have seen gusts to 76 knots (140kmh) reported at the Signal station on the now casting this morning
And yet its only gusting to 30 to 35 knots in the Hauraki Gulf at the moment
its a classic pressure wind..a river of wind running down this side...ie the wind pressure has been building up...as the wind field has not expanded to the other side of the north island yet..once it does that it then eases a bit on this side

[tornado]

i dont think we will have any thunder today : (

[Awhituobs]

111 kmh gusts (60 kts) here now
I see 83 knots (153 kmh) gusts now at signal station

[jamie]

Big rain here all morning. Climbing quickly to 25mm now. Wasn’t expecting this much. No wind tho.


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[Chris W]

Looking convective outside in Amberley, some cumulus mediocris out there if I have the type right.

[cbm]

Big rain here all morning. Climbing quickly to 25mm now. Wasn’t expecting this much. No wind tho.


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Sure is. That was tricky to drive in, just a few minutes ago.

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