Ex-TC Ita affecting NZ - April 17-19 (Thu-Sat)

ricky · Unread post by **ricky** » Fri 18/04/2014 00:05

Looks like a thunderstorm moving south into the Hauraki gulf now...

ben g · Unread post by **ben g** » Fri 18/04/2014 00:28

Nice show alright!

Chris Raine · Unread post by **Chris Raine** » Fri 18/04/2014 02:15

Wind has increased in Oamaru last hour steadily blowing at 20 knots , steady moderate rain since 6pm last night ,currently 19.8mm in the gauge , lights flickering

jamie · Unread post by **jamie** » Fri 18/04/2014 06:04

I have an awesome display of lightning out my bedroom window looking east. Perfect view of IC lightning going every 10 secs or so

tgsnoopy · Unread post by **tgsnoopy** » Fri 18/04/2014 06:06

Good show, but not photogenic. Watching it coming in from the North at Ferguson Park.

jamie · Unread post by **jamie** » Fri 18/04/2014 06:14

I remember this exact thing happened 21st April last year. I was sitting in bed watching early morning lightning over Tauranga. We then had torrential rain thunder and funnel cloud in the afternoon.

Tauranga must be getting continuos rolling thunder. This lightning is a strobe fest as Willo put it. I'm not even getting to 5 secs between each flash.

Manukau heads obs · Fri 18/04/2014 06:19

More of that to come for upper NI today
Looking at developing frontal line to NW

jamie · Unread post by **jamie** » Fri 18/04/2014 06:20

tgsnoopy wrote:Good show, but not photogenic. Watching it coming in from the North at Ferguson Park.

It's incredible photogenic here by he cloud is being lit up really well with a dusk sky giving an eery lighting

tgsnoopy · Unread post by **tgsnoopy** » Fri 18/04/2014 07:02

jamie wrote:Tauranga must be getting continuos rolling thunder. This lightning is a strobe fest as Willo put it. I'm not even getting to 5 secs between each flash.

Close to it. Am very frustrated. Over 10k detections by my Blitzortung Loops, have seen quite a few CG's and nothing detected by the system

jamie · Unread post by **jamie** » Fri 18/04/2014 07:10

I would have thought Tim's and another upper nz one would have detected that lightning. So why is the system not working?

treetop · Unread post by **treetop** » Fri 18/04/2014 07:22

There were a lot of weak intercloud flashes, maybe only the CG and long anvil crawlers showing up as I have noticed in the past. Hope fully more to come upstream later. Being west of Tauranga , TStorm activity usually splits ,one moving through Waikato and the other East of a line from Mayor Is to Tauranga,will need to chase today cause nothing happening here !Tepuke/Whakatanae {coast} my pick for a chase tgsnoopy ? Happy Easter everyone

David · Unread post by **David** » Fri 18/04/2014 07:24

Overnight low of 19.4C here. Really warm! Hopefully some thunder today

CHCH Weather Chaser · Fri 18/04/2014 07:45

Easterlies gusted to gale here overnight with a further 24mm since midnight bringing the total to 58mm for the event so far. Driving light rain this morning currently.

NZstorm · Unread post by **NZstorm** » Fri 18/04/2014 07:51

I got up at 1.30am and could see distant flashes every 5 seconds. Shame that line didn't come in closer to Auckland!

David · Unread post by **David** » Fri 18/04/2014 07:55

Metservice is showing 29mm in the last hour at Tauranga

Nev · Unread post by **Nev** » Fri 18/04/2014 07:59

What a day here yesterday! With Waiheke hosting the Easter International Jazz Fest, probably our busiest weekend of the year, about half the island was without power for more than 9 hours from about 11am. Sealink vehicle ferries also cancelled sailings yesterday morning, which meant no fresh produce at the supermarket or stores to top-up already depleted stocks due to the impending holiday weekend. The power outages also meant no petrol at the pumps. And today, most stores are closed. We're used to outages here, but I think this could put the future of our historically finically shaky Jazz Fest in serious jeopardy.

Ended up with 37.5mm from late Wednesday to early Thursday.

I see Kaikoura recorded 109mm yesterday, plus at least 38mm to 6am this morn. Whitianga Aero also recorded 100mm yesterday. And for the 24 hours to 9am yesterday, Kerikeri Aero recorded 109mm.

Here are some of MS's top gusts yesterday…

Code: Select all

April 17 Maximum Gust Speeds ℅ MetService
 
Site                      knots   km/h

Mamaku Radar                76    141 
Cape Reinga                 74    137 
Stephens Island             73    135 
Westport Airport            68    126 
Cape Turnagain              68    126 
Mahia Radar                 67    124 
Brothers Island             63    117 
Cape Kidnappers             63    117 
Whangaparaoa                62    115 
Mokohinau                   59    109 
Golden Valley               59    109 
Castlepoint                 57    106 
Farewell Spit               56    104 
Levin                       56    104 
Paeroa                      54    100 
Mana Island                 54    100 
Ardmore Aerodrome           53     98 
Le Bons Bay                 53     98 
Whakatane Airport           51     94 
Whangarei Airport           50     93 
Purerua                     50     93 
Whenuapai                   49     91 
Palmerston North Airport    49     91 
Cape Campbell               49     91 
Kerikeri Airport            48     89 
Rotorua Airport             48     89 
Ohakea                      48     89 
Nelson Airport              48     89 
Milford Sound Airport       48     89 
Kaitaia Airport             47     87 
Kelburn, Wellington         47     87 
Tauranga Airport            46     85 
Auckland Airport            46     85 
Hamilton Airport            45     83 
Waiouru                     45     83 
Paraparaumu Airport         45     83 
Hicks Bay                   45     83 
New Plymouth Airport        44     81 
Wellington Airport          44     81 
Mahia                       44     81 
Napier Airport              44     81

Also thought this MS isobar map posted on Facebook might be worth recording.

On [url=https://www.facebook.com/photo.php?fbid=688219994573395&set=a.154197624642304.35091.136819026380164&type=1&relevant_count=1]Facebook[/url], MetService wrote: This is the midday isobar map showing the deep low west of the North Island and strong pressure gradient over the country, hand drawn by our severe weather desk! ^AR

MetService isobar map - Apr 17.jpg

NZstorm · Unread post by **NZstorm** » Fri 18/04/2014 08:14

Will keep an eye on western Waikato this afternoon for possible storms chase. Just need that boundary to our west to come on shore a bit! Or maybe some convergence will occur anyway.

Looks like the overnight thunder was as far south as Taupo. Upper level divergence from the jet stream exit region was a major player in the overnight thunderstorm development.

treetop · Unread post by **treetop** » Fri 18/04/2014 08:19

As the flow turns more N/W west Waikato looks good, less wind too so maybe some heating and sea beeze convergence ?

spwill · Unread post by **spwill** » Fri 18/04/2014 08:57

There is a small convergence area showing up near Hunua, might be a spot to watch.
Current weather here is sunshine/cloud mix, 21C, dp 18C.

jamie · Unread post by **jamie** » Fri 18/04/2014 09:41

It looks like thunder is on the cards today tomorrow and sunday.

NZstorm · Unread post by **NZstorm** » Fri 18/04/2014 09:58

jamie wrote:It looks like thunder is on the cards today tomorrow and sunday.

Need to keep an eye out for convergence today.

North Auckland could be worth a lightning chase late tonight if the gfs is correct.

Sunday PM is looking great at this stage with a potent upper level system crossing from the west.

sw_windbow · Unread post by **sw_windbow** » Fri 18/04/2014 10:41

45mm so far for Dunedin. Looks like another 20mm on its way over the next 12-16 hours.

Leith Stream is at about 45 cumecs and rising. Webcam at the bottom of this link shows it starting to ease out of its banks next to the Gregs factory not far from the Leith mouth into the Otago Harbour.

http://www.propserv.otago.ac.nz/webcamera

jamie · Unread post by **jamie** » Fri 18/04/2014 11:22

Convergence getting going on western waikato.

David · Unread post by **David** » Fri 18/04/2014 11:40

This BOP site near Te Puke shows 48mm in an hour between 8am and 9am this morning
http://monitoring.boprc.govt.nz/Monitor ... ?point=600

ricky · Unread post by **ricky** » Fri 18/04/2014 11:44

Looks like one continuous bit of thundery goodness there all morning!

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