Unsettled Period Late September 2009

[MoorfNZ]

1.2mm in the gauge much better than the nothing we got yesterday, and i also noticed the rain drops too John large but certainly melted hail stones i think.

I had about 5 seconds of very large hail immediately before the showers began - large enough for me to rush out to pick up my sick chook and put her in the undergrowth!

Sun is out here, rain stopped.

[Chris Raine]

Big beefy Cb's in Omaru this arvo. Heavy hail sower around 1300 with large hail up to 10mm diameter . South Hill area well covered

[Andrew Massie]

Pic of the southerly buster approaching Templeton just after 2pm.

Here's my pictures of the same event. One from Hampton's Road in Prebbleton looking SW where I observed one CC of lightning and another of arriving home as the southerly buster moved over.
Notice the high-tec. Storm chase mobility vehicle

JohnGaul
NZThS

Gee, John, there's a few crappy old direlict morris minors just sitting on the side of the road out your way! They're even the same colour!

[Tornado Tim]

The cold front has intensified quite a bit and we are in the firing line! (Unless it surges north)
Hopefully it wont weaken cross your fingers!

[NZ Thunderstorm Soc]

Theres a 'dead' CB forming to the SW of 'Thunderstorm corner' at the moment

JohnGaul
NZThS

[jamie]

looks good out in the tazzy at the moment for sure. We are are getting a heavy shower here at the moment. I would say the heaviest of the day so far.

[CHCH Weather Chaser]

Theres a 'dead' CB forming to the SW of 'Thunderstorm corner' at the moment

JohnGaul
NZThS

The Dark CB is approaching rather quickly just to the south of here now and the radar shows a very small intense shower. (7pm)

[dogmelon]

I can see that big cb the the south of chc too. It looks big. What makes some cbs make lightning and others not?

[NZ Thunderstorm Soc]

No Ooooooooomph, trigger whatever.
....and probably too late in the day for this type of thunderstorm development scenario, eg. no ground heating.

JohnGaul
NZThS

[NZ Thunderstorm Soc]

Rain from this CB moving across at the moment

JohnGaul
NZThS

[Vertigo]

to be more precise, dogmelon, the Cb probably doesnt have the required height or updraft velocity to gather enough charge seperation.

[dogmelon]

Okie dokie, thanks for explaining that for me.

[Manukau heads obs]

darn....for some reason my windspeed has stopped recording....during a heavy rain event ..along with 45 knot winds....might be water in a connection...maybe...have had a look in the rain with a torch but cant find anything obvious in the dark.....darn it...

[Andrew Massie]

CRC contact cleaner.. repels water, and alcohol based so it evaporates instantly!

[Storm Struck]

There goes the flick from the cold front, delivered another shower of rain here.
Interesting on the news weather tonight showing snow showers falling on the Dunedin Hill suburbs if i am correct, that must be snow to 300-400m was it even forecast?.
You can clearly see the trough just south of Wellington on the 8pm radar, now for the first low system busy times .

[Manukau heads obs]

just got a SW wind change here now....interesting...
temperature drop with it too, and barometer jump up...

[David]

Can't believe how warm it is!! Has been 16-16.5°C since dusk, DP about the same. Doesn't seem to be going anywhere so maybe a low over 15 tonight for parts?

[Lacertae]

Hey John, can tell us again what and where is the "thunderstorm corner" please ?

[Vertigo]

activity on the front has all but ceased. should just be a wet and possibly windy day, but, unless some uplift occurs, there wont be much in the way of thunder.

[Manukau heads obs]

light easterly wind in the auckland area again this morning..just like yesterday morning...i.e the warm front must have moved back north onto us again!

[NZstorm]

I expected the lightning activity to die away on that front as the instability was modeled to weaken on it as it crossed the Tasman. We will see what happens with it today, hopefully more storms could fire on it this afternoon/evening. It crosses Auckland around 6pm by the looks.

[NZstorm]

The warm front is shifting south now. NW kicking in here with temp rise. I'm hopeful we get a dry interlude between now and the cold front later, or is that wishful thinking LOL.

[spwill]

Current dewpoint is 13C, higher dp air is just north of Auckland, should spread back down ahead of the Front.

Good temp spread from south to North with this system, at 6am Gore was -2C and Whangarei 17C, at mid day yesterday Gore was 5C and Whangarei 21C, a 16C difference.

[Tornado Tim]

The front is starting back up now

[Michael]

Might see the Sydney haze in the W/end when were between the next system next week.