Active Low over North Island - Apr 14-17

NZstorm · Unread post by **NZstorm** » Thu 13/04/2017 07:24

Cooler unstable airmass spreading into the west of the North Island late Friday with New Plymouth looking the best spot to catch a gusty thunderstorm/small hail. More colder unstable air during the Easter break by the looks.

NZstorm · Unread post by **NZstorm** » Fri 14/04/2017 07:34

This cold upper level system coming through next 3 days could be worth a thread. Its winter style thunderstorm forecasting with shortwave energy defining the areas of thunder risk.

Kicks off later today as the trough in the Tasman advances into moisture currently over the NI.

500mb chart for 12Z today

Manukau heads obs · Fri 14/04/2017 07:36

we have already had a beefy shower come through here this morning on the NW wind

Manukau heads obs · Fri 14/04/2017 14:23

some blown off anvil tops on the showers out to my west

spwill · Unread post by **spwill** » Fri 14/04/2017 17:57

Unstable looking skies, no lightning being picked up anywhere.

NZstorm · Unread post by **NZstorm** » Fri 14/04/2017 18:25

CB coming into Bethels Beach west Auckland about 4pm.

Manukau heads obs · Fri 14/04/2017 20:30

yes, that CB we got rain from , looked great as it approached

NZstorm · Unread post by **NZstorm** » Sat 15/04/2017 08:00

Watch out for the front late in the day, may have a thunderstorm or two with it in the west.

A waterspout possible in Taranaki tomorrow.

Rogue · Unread post by **Rogue** » Sat 15/04/2017 14:07

Nice convection yesterday close to home, within the 10mins between taking this shot and walking down to the beach it expanded and started bucketing down :/

CBs_20170414.JPG

Can see low topped CB's with wind swept anvils to the north today.

Manukau heads obs · Sat 15/04/2017 16:22

lots of rain from low topped clouds today here

Manukau heads obs · Sat 15/04/2017 17:58

nice line of CB's on the horizon

NZstorm · Unread post by **NZstorm** » Sun 16/04/2017 07:11

Some interesting weather over the North Island today before we get into the extended period of settled weather.

The 500mb vortex is moving closer the the North Island today and they typically are thunderstorm makers due to rising air and colder temps aloft. Afternoon heating will assist with the widely scattered showers and isolated thunderstorms/small hail. The vortex crosses the North Island tonight and moves away tomorrow.

Nev · Unread post by **Nev** » Sun 16/04/2017 08:11

Report of a possible 'twister' at around 5:15pm on Friday and funnel-cloud video…

'Twister throws branches over houses in Rotorua suburb' - Rotorua Daily Post
'Rotorua residents report seeing twister on Good Friday' - Waikato Times

spwill · Unread post by **spwill** » Sun 16/04/2017 08:22

Interesting news report there.

Nev · Unread post by **Nev** » Sun 16/04/2017 08:35

MS have a moderate T-Storm risk for the west and north of the North Island today…

MetService - Thunderstorm Outlook

Valid to: Midnight Sunday 16 Apr 2017
Issued at: 8:24am Sunday 16 Apr 2017

A low and area of cold upper air are expected to move slowly towards central and northern New Zealand during today, bringing unstable conditions to much of the North Island and top of the South Island.

There is a moderate risk of thunderstorms from western areas of Northland,Auckland, Waikato, Waitomo, Taumarunui, all of Taranaki and about Nelson west of the City at first, but extends this afternoon and evening to most areas of the North Island from Taupo and Bay of Plenty northwards. Any thunderstorms that eventuate are expected to produce localised heavy rain of 10 to 25mm per hour and small hail. Note, this risk area becomes confined to coastal Waikato to Taranaki, and also Nelson and the eastern Bay of Plenty tonight.

A lesser risk of thunderstorms extends over the remainder of Nelson, Buller,northern Marlborough, and the lower North Island as depicted on the chart.

MetService T-storm Outlook map - Apr 16.png

NZstorm · Unread post by **NZstorm** » Sun 16/04/2017 09:54

Thanks for the report Nev.

Good upper flow today, if we can get some low level NNE flow into convection then something interesting could happen like decent hail and a funnel. Considering a chase today.

spwill · Unread post by **spwill** » Sun 16/04/2017 10:02

Warm here ahead of that showery air mass, current 22C, dp 16C.

jamie · Unread post by **jamie** » Sun 16/04/2017 10:53

Got my eyes to the sky today. Looks decent incoming on the radar.

Tornado Tim · Unread post by **Tornado Tim** » Sun 16/04/2017 11:23

CB just west of Brians is dishing out a little lightning atm.

GraemeWi · Unread post by **GraemeWi** » Sun 16/04/2017 12:06

Good looking cb off the west coast of Auckland

Tornado Tim · Unread post by **Tornado Tim** » Sun 16/04/2017 13:21

And we have Thunder now, nice!

Tornado Tim · Unread post by **Tornado Tim** » Sun 16/04/2017 13:26

The frontal line developing well with the SFC temps around 20-21 pre-front.

jamie · Unread post by **jamie** » Sun 16/04/2017 13:35

Tim the cell heading your way just missed me. Has a nice hail shaft and a funnel cloud.

spwill · Unread post by **spwill** » Sun 16/04/2017 14:15

That cloud top looks good, NE of Hamilton

Nev · Unread post by **Nev** » Sun 16/04/2017 14:54

Quite a few distant rumbles getting louder just to the NW of here…

Edit: Whoa! Loud continuous rumble, crackling now…

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Active Low over North Island - Apr 14-17

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