Tasman low with embedded front & troughs Jan 17- 23

[Cyclone Tracy]

Nice start to round 2, 12mm so far this morning.

[NZstorm]

16mm here.

Potential is there for downpours in Auckland tomorrow morning as the trough comes through.
The Total Totals are around 49 which would support lightning.

[Cyclone Tracy]

Yes, good point NZstorm on the total totals. K index also around mid 30's for upper north island this afternoon, so with the available moisture, downpours a very good chance across the upper north island.

Solid looking band approaching Northland at the moment off the back of that warm front. MS have a thunderstorm watch out now.

Currently 17mm , 22c with a 21dp.

[Tornado Tim]

Very good moisture convergence for tommorows setup. All that moisture will be put to good use and offsets the sat adab lapse rate by quite a good margin despite 500hpa temps forecast at -11 to -12.
Agree with NZstorm, the Lightning risk is probable with any convection, shear is zilch, so wet n pulsy storms.

There is also moderate to high amount of downdraft CAPE extended along the trough, so some good gusts possible esp when storms collapse, exacerbated by the high wv content any potential storms will have.

[Cyclone Tracy]

25c, 22c DP. Highest DP I've recorded this summer so far. It's ready to pop.

[spwill]

There has been a couple of thundery cells over southern parts of Northland last hr.

[Cyclone Tracy]

A couple of rumbles north west of here 5min ago.

[Tornado Tim]

Drove into a downpour in Hamilton on the back from work, massive rain drops.....

[jamie]

This humidity is intense!

[cbm]

Taken in the Kaipaki area right now.

Sent from my SM-N950F using Tapatalk

[03Stormchaser]

Very nice photo!

[Tornado Tim]

This humidity is intense!

Yea your DP is still around 20!
Flip what a contrast to me once the odd Thundershower has cooled things down.

21.6 and DP at 14.6, nice change for a brief amount of time anyway......

[David]

Hey Tim. I think something might be wrong with your humidity sensor? I notice it was even showing less than 70% around dawn which seems way too low given this subtropical airmass

[David]

That area of heavy rain up north earlier today sure fizzled out. Just some spotty rain here this evening. Dewpoint around 20-21C most of the day.

[Cyclone Tracy]

Looks like a little convergence from SW of Auckland to the north of Hamilton just sprung up on the radar, couple of red spots in it.

Nice pic @cbn

[Tornado Tim]

Hey Tim. I think something might be wrong with your humidity sensor? I notice it was even showing less than 70% around dawn which seems way too low given this subtropical airmass

Indeed, the anemometer seems to have also gone south as well (the bearings have started to cease). I only got the ISS less than a few years ago, the previous ISS and its components lasted much longer than this lot.
Feel like chucking the whole Weather Station project in after it costs soo much.......

[jamie]

Really nice heavy tropical downpour right now. No wind, house wide open. 22 with a 21dp or 93% humidity.

[jamie]

Already have a small cb at morrinsville. Early start but not surprised.

[Razor]

Severe TS warning for AK

Issued by MetService at 09:46 am Tuesday 23 January 2018.
Valid until 10:45 am Tuesday 23 January 2018.

This warning affects people in the following local government areas:
AUCKLAND CITY, RODNEY and ALBANY.

At 09:45 am, MetService weather radar detected severe thunderstorms near AUCKLAND, OREWA, ALBANY, NORTH SHORE, DAIRY FLAT, WHANGAPARAOA, BROWNS BAY, GREENHITHE, COATESVILLE, PAREMOREMO, BIRKENHEAD, MILFORD, MAIRANGI BAY, GLENFIELD, NORTH HARBOUR, LONG BAY, TORBAY, ROTHESAY BAY and CASTOR BAY.

These severe thunderstorms are moving towards the west, and are expected to lie near AUCKLAND, OREWA, ALBANY, NORTH SHORE, DAIRY FLAT, WHANGAPARAOA, BROWNS BAY, GREENHITHE, COATESVILLE, PAREMOREMO, MILFORD, MAIRANGI BAY, GLENFIELD, NORTH HARBOUR, LONG BAY, TORBAY, ROTHESAY BAY and CASTOR BAY at 10:15 am and near AUCKLAND, OREWA, ALBANY, NORTH SHORE, WHENUAPAI, DAIRY FLAT, WHANGAPARAOA, BROWNS BAY, GREENHITHE, COATESVILLE, PAREMOREMO, MAIRANGI BAY, GLENFIELD, NORTH HARBOUR, LONG BAY, TORBAY, ROTHESAY BAY and CASTOR BAY at 10:45 am.

These thunderstorms are expected to be accompanied by very heavy rain.

Very heavy rain can cause surface and/or flash flooding about streams, gullies and urban areas, and make driving conditions extremely hazardous.

A Severe Thunderstorm Watch remains in force for NORTHLAND, AUCKLAND, GREAT BARRIER ISLAND, COROMANDEL PENINSULA, WAIKATO and BAY OF PLENTY.

[Cyclone Tracy]

Solid downpour just north of here. Took a snap as it converged on Milford. 44mm in around an hour so far.

[David]

Mairangi Bay weather station picked up 50mm in an hour.

[spwill]

An isolated Cb over the North Shore. With the sun coming out now I can see a few showers are developing over South Auckland.

[Cyclone Tracy]

Albany 62mm in that downpour and now has 92mm for the day so far

[Razor]

Looks pretty intense on this pic from MS social media

[Cyclone Tracy]

That's an intense radar... Looked visually intense from my vantage point.

25c now with a 22.2c DP and the sun out....