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Active front/possible thunderstorms for upper NI 25 August
Posted: Sat 24/08/2013 21:21
by David
Metservice have a high risk of thunderstorm activity with an active front crossing the NI tomorrow morning.
Also a severe weather watch out for Auckland - apparently the front may become slow moving.
Severe thunderstorm outlook below
tstormOutlook25Aug2013.png
Valid to: Noon Sunday 25 Aug 2013
Issued at: 9:01pm Saturday 24 Aug 2013
An active front is expected to move south over Northland overnight, then Auckland, Coromandel Peninsula and northern Waikato from early Sunday morning.There is a high risk of significant convection and thunderstorms with the front,bringing squally wind gusts of 90-110 km/h and heavy rain of 15-25mm/hr.Additionally there is a moderate risk that the significant convection and thunderstorms could be SEVERE, with associated winds gusting stronger than 110 km/h. A SEVERE THUNDERSTORM WATCH has been issued. Small tornadoes are also possible.
For the rest of Waikato, Waitomo and the western Bay of Plenty, there is a moderate risk of thunderstorms from early morning, bringing heavy rain and strong wind gusts of 90-110 km/h.
No thunderstorms expected over the rest of the country.
http://www.metservice.com/national/warn ... rm-outlook
Re: Active front/possible thunderstorms for upper NI 25 August
Posted: Sat 24/08/2013 22:45
by Tornado Tim
Looks fairly active out there atm, hopefully it stays together….
The upper section (above Northland ) however has seemed to have died off.
Re: Active front/possible thunderstorms for upper NI 25 August
Posted: Sun 25/08/2013 04:04
by Area51
Wow! That arrived quickly! Lightning/thunder across Manukau City/Auckland Airport at 4am.
Re: Active front/possible thunderstorms for upper NI 25 August
Posted: Sun 25/08/2013 04:18
by Area51
Very heavy rain here at Auckland Airport with hail and significant lightning/thunder activity. Moving quickly looking at the radar.
Re: Active front/possible thunderstorms for upper NI 25 August
Posted: Sun 25/08/2013 04:23
by spwill
Yes, has been lightning/thunder here, mostly in our eastern sky, brief heavy downpour.
Re: Active front/possible thunderstorms for upper NI 25 August
Posted: Sun 25/08/2013 04:27
by Area51
Eased off at the airport now but another squall line inbound from the northwest. Hope I get to the car between downpours!
Re: Active front/possible thunderstorms for upper NI 25 August
Posted: Sun 25/08/2013 05:08
by spwill
Another lightning/thunder show here for the last 40mins mostly in our western sky this time.
Re: Active front/possible thunderstorms for upper NI 25 August
Posted: Sun 25/08/2013 05:28
by NZstorm
Just had a very close CG.
Re: Active front/possible thunderstorms for upper NI 25 August
Posted: Sun 25/08/2013 05:37
by David
Third lot Ive heard/seen now. None of it that close though. Not much rain so far
Re: Active front/possible thunderstorms for upper NI 25 August
Posted: Sun 25/08/2013 05:52
by NZstorm
19mm in Grey Lynn last 3hrs.
Re: Active front/possible thunderstorms for upper NI 25 August
Posted: Sun 25/08/2013 06:09
by spwill
Overhead lightning at times this part of town. Too much rain for photography but I had a go
Re: Active front/possible thunderstorms for upper NI 25 August
Posted: Sun 25/08/2013 06:12
by David
Sudden thunderstorm here 6am. 1second from lightning to thunderclap. Rain rate hit 226 mm/hr (new record for me) with small hail but it didn't last long.
Re: Active front/possible thunderstorms for upper NI 25 August
Posted: Sun 25/08/2013 06:54
by NZstorm
Good photo spwill. I did have a go at trying to get a photo but too much rain and sheet lightning.
I see the dewpoint has dropped from 13C to 11C.
Active front/possible thunderstorms for upper NI 25 August
Posted: Sun 25/08/2013 07:49
by jamie
Darn... Wish I was home. Looks like a great line approaching. Is it still active?
Re: Active front/possible thunderstorms for upper NI 25 August
Posted: Sun 25/08/2013 07:51
by Nev
Yeah, nice show here, despite being obscured by the rain - 11mm here.
Reports of minor flooding around Akld and a house in Makarau, north of Helensville, was hit by lightning around 5am - no damage though.
Re: Active front/possible thunderstorms for upper NI 25 August
Posted: Sun 25/08/2013 07:52
by iomkiwi
They just got that warning out in time
We had a storm go thru right on midnight with rain rate at 348mm/hr, then another one at around 2:15am
Re: Active front/possible thunderstorms for upper NI 25 August
Posted: Sun 25/08/2013 11:34
by spwill
This loop shows storms firing up on the front as it crossed the upper North Island
http://wwlln.net/WWLLN_movies/Movie_of_ ... an_BIG.gif
Current GFS suggests more storms/hail possible around Wednesday/Thursday with the incoming cold system
Active front/possible thunderstorms for upper NI 25 August
Posted: Sun 25/08/2013 11:44
by littleheaven
I was woken just before 4am by some really intense rain and what sounded like a few small hailstones. I've lived in this house for 16 years and I would be fairly comfortable in saying that it was the loudest downpour I've experienced. I was quite worried about flooding. The thunder started not long after, some of it shaking the house. Kept me awake until 5.30am, at least. Can't believe the little guy slept through it. All the neighbours' lights were on!
