Low pressure sequence April 10 - 14

Cyclone Tracy · Unread post by **Cyclone Tracy** » Thu 12/04/2018 16:46

This front heading towards the NI has got the jet pack on. Multicell clusters continue to spark near the warm front. Severe thunderstorm watch in place for Northland, Auckland & Waikato with localised possible tornadoes in the MS language again.

The warm front tomorrow night into Saturday is upgrading on Access R latest 00z to 100mm+ around Auckland. A stalling convergence zone it thinks.

NZstorm · Unread post by **NZstorm** » Thu 12/04/2018 19:59

Dewpoint chart here for tomorrow nights warm front. A favourable zone for convection/thunder.

spwill · Unread post by **spwill** » Thu 12/04/2018 20:57

Does look interesting for rain and possible thunder here Saturday, humid air under coolish upper levels showing on the GFS.

Parts of Mt Eden still have no power.

Cyclone Tracy · Unread post by **Cyclone Tracy** » Thu 12/04/2018 21:41

Taranaki Civil Defence is reporting a localised tornado in New Plymouth in the Strandon area this evening. Damage currently being assessed according to media reports

SnwAddct · Unread post by **SnwAddct** » Fri 13/04/2018 11:46

Rather wild night in Swanson on Tuesday. Fence, Several Trees and other things down. My property was looking like a scene out of Jumanji on Wednesday.

NZ Thunderstorm Soc · Fri 13/04/2018 16:42

Apparently, according to the ODT, the was a tornado and a thunderstorm in Dunedin Tuesday evening or night.
I thought i would put this on here for the record for this weather event.
Some chap from the Pine Hill area posted some thing on Facebook, I believe

Cyclone Tracy · Unread post by **Cyclone Tracy** » Fri 13/04/2018 17:19

Radar starting to fill in around the western side of the NI. Some clusters sparking closer to the Upper NI in the last hour, a couple around 100 km south west of Auckland.

SnwAddct · Unread post by **SnwAddct** » Fri 13/04/2018 17:40

Cyclone Tracy wrote: ↑Fri 13/04/2018 17:19 Radar starting to fill in around the western side of the NI. Some clusters sparking closer to the Upper NI in the last hour, a couple around 100 km south west of Auckland.

Just noticed that! Hoping it arrives here in Swanson $\:D/$

David · Unread post by **David** » Fri 13/04/2018 18:53

Some quite heavy falls embedded in this area of rain. Be interesting to see how much we get over the next 24 hours.

NZstorm · Unread post by **NZstorm** » Fri 13/04/2018 20:52

Just seen a flash with distant thunder to the north.

spwill · Unread post by **spwill** » Fri 13/04/2018 21:04

Thought I heard distant thunder, radar shows Cb just to the north
Watch for the Auckland temperature to move up shortly, currently 14C.
I see kaitaia is on 19.4C, dewpiont 18C in the warm humid air.

spwill · Unread post by **spwill** » Fri 13/04/2018 21:15

Distant lightning observed to the NW.

Cyclone Tracy · Unread post by **Cyclone Tracy** » Fri 13/04/2018 21:39

That next cluster in the Tasman west of the Waikato moving NE is still developing with near -60c cloud tops.

David · Unread post by **David** » Fri 13/04/2018 23:40

Cyclone Tracy wrote: ↑Fri 13/04/2018 21:39 That next cluster in the Tasman west of the Waikato moving NE is still developing with near -60c cloud tops.

Very heavy rain woke me up - rain rate hit 100 mm/h

Cyclone Tracy · Unread post by **Cyclone Tracy** » Sat 14/04/2018 01:36

Heavy rain, lightning and thunder here

David · Unread post by **David** » Sat 14/04/2018 01:44

Heard the distant thunder here. 18mm last hour!

David · Unread post by **David** » Sat 14/04/2018 02:55

Over 50mm in Howick last 4 hours.. Surprised a rain warning didn't get issued.

Cyclone Tracy · Unread post by **Cyclone Tracy** » Sat 14/04/2018 05:27

South of the Harbour in Auckland was right in the sweet spot of the convergence zone. Some decent totals stacking up now. More development in the Tasman underway, maybe targeting south of Auckland for the next round. I've had 25mm on the north side, Balmy 20c with a 18c DP.

Nev · Unread post by **Nev** » Sat 14/04/2018 06:44

58mm here overnight with heaps of thunder and lightning, although the rain was so intense at times that it probably drowned out a lot of the thunder…

spwill · Unread post by **spwill** » Sat 14/04/2018 07:08

The active zone was over us around 2 -3am, woken by heavy showers with some thunder and lightning. I noticed David got 33mm in that hr.

Currently the thundery convergence line is lying just south of the Bombay Hills.

David · Unread post by **David** » Sat 14/04/2018 07:12

Had 86mm here overnight. Including a peak 1-hour total of 35mm

NZstorm · Unread post by **NZstorm** » Sat 14/04/2018 07:20

Got woken by thunder 2am. Saw a CG with a few seconds to thunder. 40mm here overnight.

jamie · Unread post by **jamie** » Sat 14/04/2018 08:02

Thunder just to my north. Hope it moves further south

Cyclone Tracy · Unread post by **Cyclone Tracy** » Sat 14/04/2018 08:26

Access R nailed this set up. Other models were never as keen on the intensity.

Solid convergence zone over the Bombay's. New development in the Tasman seems to maybe targeting Auckland in a few hours as the zone wriggles north.

NZstorm · Unread post by **NZstorm** » Sat 14/04/2018 08:27

Current dewpoint at Auckland airport is 19C whereas Hamilton airport 13C.

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Low pressure sequence April 10 - 14

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