Tasman low with embedded front & troughs Jan 17- 23

David · Unread post by **David** » Tue 23/01/2018 11:37

Yeah, probably the most uncomfortable day so far this month. Currently 26C with 21C dewpoint on my station.

melja · Unread post by **melja** » Tue 23/01/2018 11:52

Even 18.3 Dp in chch

Sent from my Redmi Note 4 using Tapatalk

Tornado Tim · Unread post by **Tornado Tim** » Tue 23/01/2018 12:10

Shes looking ripe and ready to go today! Convection is surprisingly crisp on the Tcu.

Cyclone Tracy · Unread post by **Cyclone Tracy** » Tue 23/01/2018 12:20

26.2c , 23.0c DP and full sun. This is going to explode.

spwill · Unread post by **spwill** » Tue 23/01/2018 12:50

Queensland weather

, 27C , dewpoint 22C.
A dry day at my place so far, with the breeze still NE there is still chance of a shower here. The best chance for a heavy shower this afternoon will be east of here.

Richard · Unread post by **Richard** » Tue 23/01/2018 13:21

Look out Napier, a storm looks to be heading towards there

spwill · Unread post by **spwill** » Tue 23/01/2018 13:49

Heavy shower through here last 10mnis.

KiwiWeather · Unread post by **KiwiWeather** » Tue 23/01/2018 13:54

We've had thunder here on and off for about 30 mins. The cloud cover came up extremely quick and now bright sunshine in between the gaps. It's sweltering.

Cyclone Tracy · Unread post by **Cyclone Tracy** » Tue 23/01/2018 13:56

Couple of pics looking SW and SE from the North Shore in Auckland taken about 1.40pm

KiwiWeather · Unread post by **KiwiWeather** » Tue 23/01/2018 13:59

Hey Spwill, Queensland wx indeed! I was in Adelaide not to long ago and I have sweated more here over the past couple of days, than I did after a serious wine tasting effort in the Barossa Valley

BeaconHill · Unread post by **BeaconHill** » Tue 23/01/2018 14:01

Just now in Napier via @samjamesz on twitter - click link for video
https://twitter.com/samjamez/status/955605562711990273

Clouds.png

KiwiWeather · Unread post by **KiwiWeather** » Tue 23/01/2018 14:04

Nice pic's. I think I might pop out for a drive and have a look around. At least the car has air-con

Cyclone Tracy · Unread post by **Cyclone Tracy** » Tue 23/01/2018 14:16

Nice wall cloud developing on that Meso Napier video. Thanks for sharing Beaconhill. Potential supercell going on MS high res radar pic

spwill · Unread post by **spwill** » Tue 23/01/2018 14:22

Sandy wrote: ↑Tue 23/01/2018 13:59 Hey Spwill, Queensland wx indeed! I was in Adelaide not to long ago and I have sweated more here over the past couple of days, than I did after a serious wine tasting effort in the Barossa Valley

Airconditioning needed here

. Showers backing off here now.

The Napier storm looks impressive.

Tornado Tim · Unread post by **Tornado Tim** » Tue 23/01/2018 14:56

Cyclone Tracy wrote: ↑Tue 23/01/2018 14:16 Nice wall cloud developing on that Meso Napier video. Thanks for sharing Beaconhill. Potential supercell going on MS high res radar pic

There is nothing I can see that signifies supercell in that Radar output, Composite Overlay Radar Images (which metservice output) are nearly worthless in determining if storm is a supercell. A high dbz (50-55) echo signifies possible small Hail but thats about it
Dopplar Wind Output and individual elevation scans is the only way to get a better picture what the overall storm structure is like.

In Raglan atm with a light Westerly and convergence occurring over the ranges around Te-Uku, might drive into something in about 30 min when I leave

David · Unread post by **David** » Tue 23/01/2018 15:42

Just starting to rain in Parnell. Huge rain drops.

Cyclone Tracy · Unread post by **Cyclone Tracy** » Tue 23/01/2018 16:07

Tornado Tim wrote: ↑Tue 23/01/2018 14:56
Cyclone Tracy wrote: ↑Tue 23/01/2018 14:16 Nice wall cloud developing on that Meso Napier video. Thanks for sharing Beaconhill. Potential supercell going on MS high res radar pic
There is nothing I can see that signifies supercell in that Radar output, Composite Overlay Radar Images (which metservice output) are nearly worthless in determining if storm is a supercell. A high dbz (50-55) echo signifies possible small Hail but thats about it
Dopplar Wind Output and individual elevation scans is the only way to get a better picture what the overall storm structure is like.

In Raglan atm with a light Westerly and convergence occurring over the ranges around Te-Uku, might drive into something in about 30 min when I leave

I did say potential

I was looking at the microburst signatures on the radar. Given the Meso structure, a dropping wall cloud and a recorded wind gust in Napier of 111 km/h, it definitely could of been a supercell

BeaconHill · Unread post by **BeaconHill** » Tue 23/01/2018 16:39

Photo taken by a friend on the outskirts of Napier as the cell passed over earlier in the afternoon.

C3C2A5C4-FA57-4EA7-AC85-1B4E13D8386D.jpeg

David · Unread post by **David** » Tue 23/01/2018 16:43

A heavy shower of 15mm in 30 minutes in Howick this afternoon. Nice cool off after the sultry day...

NZstorm · Unread post by **NZstorm** » Tue 23/01/2018 17:02

You need the velocity data to know if there was rotation in that Napier storm. But the upper flow was weak so any rotation would be short lived. I would call that structure a shelf cloud.

Cyclone Tracy · Unread post by **Cyclone Tracy** » Tue 23/01/2018 17:29

yes NZstorm, agree with you and Tim on more data needed to analyse properly but I think there is potential. There were 2 separate cells moving right and left before they reached Napier. Here is radar and IR sat pic. To me a shelf cloud would have been on a squall line but these cells were separate at the time those video's and images were taken. Napier airport had the 111 km/h gust according to MS.

23.4mm for my round 2. It all went left and right today here. 66mm for the thread, 135mm for Jan so far.

Willoughby · Unread post by **Willoughby** » Tue 23/01/2018 17:57

What's the point of the government buying multi-million doppler radar systems if the public never has access? Odd.

TonyT · Unread post by **TonyT** » Tue 23/01/2018 18:05

Willoughby wrote: ↑Tue 23/01/2018 17:57 What's the point of the government buying multi-million doppler radar systems if the public never has access? Odd.

NZ Thunderstorm Soc · Tue 23/01/2018 21:46

Very clever you guys

Good shots and reports on the Hawkes Bay's storms for today.
Nice capture of the CG in today's Napier storm.
Yes, a shelf cloud all-right like what you get in Canterbury like those cold southerly changes that were experinced in West Melton when I was there.

Orion · Unread post by **Orion** » Tue 23/01/2018 22:21

A-1 photo of the lightning BeaconHill

Compliments to your photographer friend

NZ Weather Forum

Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23

Re: Tasman low with embedded front & troughs Jan 17- 23