NI Low #2... Thundery and Convective we hope!

spwill · Unread post by **spwill** » Sun 30/04/2006 16:38

alrighty, who is up to a drive?
we will get there just on dark, so it could be a good show?

Dewpoints are too low to chase it, will die quickly before sunset.

Photo,the Cb seen through a standard lens.

NZstorm · Unread post by **NZstorm** » Sun 30/04/2006 16:40

The Waikato storm looks finished now. Showing signs of weakening.
The day is starting to cool off now so thats it.

Manukau heads obs · Sun 30/04/2006 16:42

there is a stable layer about half way up, and then it broke through that
so the updrafts are probably not extending enough verticaly through over enough length at a good speed to fire up lots of static charge for lightning....good theory?

agingaquarian · Unread post by **agingaquarian** » Sun 30/04/2006 16:44

Can this novice ask what you may all think is an ignorant question. What is a cb - cumulus buildup or what?

Manukau heads obs · Sun 30/04/2006 16:56

NZstorm has a great web site here for cloud types etc:
http://www.thunderstorm.co.nz/cloud_identification.htm

agingaquarian · Unread post by **agingaquarian** » Sun 30/04/2006 17:00

What a great site. Many thanks. Have bookmarked it for further study and reference!

Achten · Unread post by **Achten** » Sun 30/04/2006 17:41

132mm from this episode so far and still raining here although the showers are a lot lighter.

NZstorm · Unread post by **NZstorm** » Sun 30/04/2006 17:46

http://www.thunderstorm.co.nz/cloud_identification.htm

That website is coming down one day soon for an upgrade.

What is a cb - cumulus buildup or what?

A cb is a cumulus buildup that has managed to grow high enough to glaciate and form a shower. Glaciation is the icing process that is typical of rain clouds.

Cameo1 · Unread post by **Cameo1** » Sun 30/04/2006 18:26

The Sunday Star Times Lightning map show we had, for the week ending
9am Saturday 29 April 2006 we had, in and around New Zealand, 18,680 lightning cloud to ground discharges!

I saw a grand total of 6

...grrrrrrr...!

agingaquarian · Unread post by **agingaquarian** » Sun 30/04/2006 18:29

Thanks for that explanation, NZ Storm. If further websites helping learners (am I the only one?) become available would be very grateful if you would post details.

03Stormchaser · Unread post by **03Stormchaser** » Sun 30/04/2006 18:37

agingaquarian wrote:Thanks for that explanation, NZ Storm. If further websites helping learners (am I the only one?) become available would be very grateful if you would post details.

Although orgionally made for christchurch Im sure the same principals can be used for Auckland or where ever you are. Made it for a friends Dad while back to do abit of Basic home forecasting.

http://03stormchaser.com/Forecasting.html

agingaquarian · Unread post by **agingaquarian** » Sun 30/04/2006 18:53

Thanks, Stormchaser. That one is really going to make me do some homework!

NZ Thunderstorm Soc · Sun 30/04/2006 19:17

Some, but weak, Cu forms today over the Port Hills.
Here is a shot of some pileus over the top of some Cu around 1:30pm

JohnGaul
NZTS

NZstorm · Unread post by **NZstorm** » Sun 30/04/2006 19:31

for the week ending
9am Saturday 29 April 2006 we had, in and around New Zealand, 18,680 lightning cloud to ground discharges!
I saw a grand total of 6 ...grrrrrrr...!

Interestingly, the Met Service lightning detector only picks up the strikes on the earth(land or sea). For every earth strike, there is on average about 3 intercloud strikes. So the real total is ....get the calculator out!

But most of the lightning that occurs in the NZ region occurs over the sea

Flutterbye · Unread post by **Flutterbye** » Sun 30/04/2006 19:42

agingaquarian wrote:Thanks for that explanation, NZ Storm. If further websites helping learners (am I the only one?) become available would be very grateful if you would post details.

Hand up here - you're not on your own

spwill · Unread post by **spwill** » Sun 30/04/2006 19:45

The Sunday Star Times Lightning map show we had, for the week ending
9am Saturday 29 April 2006 we had, in and around New Zealand, 18,680 lightning cloud to ground discharges!
I saw a grand total of 6 ...grrrrrrr...!

Coromandel is just two hours away.

Paul Mallinson · Unread post by **Paul Mallinson** » Sun 30/04/2006 20:53

The lightning location system is one of the most up todate in the world.

It will pick up cloud to cloud lightning, but I understand not as well as cloud to ground lightning.

From memory, the efficiency for detecting CG strokes is about 95% to a location accuracy around 500m metres.

There are two ways of fixing a stroke location. One uses the radio signal (spheric) which has a characteristic discharge shape to determine a direction. Other antennas are then triangulated to determine a point of origin for the signal. The second method uses the time of arrival of the signal at a number of antennas. This can also determine a point of origin too. Then both determinations are then combined to give the final location.

Paul

Michael · Unread post by **Michael** » Sun 30/04/2006 21:56

Friday were a lot,the sky was flashing all the time that morning and again that evening

NZ Thunderstorm Soc · Sun 30/04/2006 22:25

Cameo1 wrote: 9am Saturday 29 April 2006 we had, in and around New Zealand, 18,680 lightning cloud to ground discharges!
I saw a grand total of 6 ...grrrrrrr...!

Your lucky!

The only lightning I've seen recently have been the static electricity as I take my jersey off in the dark over my head

JohnGaul
NZTS

Flutterbye · Unread post by **Flutterbye** » Sun 30/04/2006 22:29

NZ Thunderstorm Soc wrote:
Cameo1 wrote: 9am Saturday 29 April 2006 we had, in and around New Zealand, 18,680 lightning cloud to ground discharges!
I saw a grand total of 6 ...grrrrrrr...!
Your lucky!

The only lightning I've seen recently have been the static electricity as I take my jersey off in the dark over my head

JohnGaul
NZTS

Thanks for the laugh John before I head off to bed.

Willoughby · Unread post by **Willoughby** » Sun 30/04/2006 23:43

Manukau heads observer wrote:gee, you are always further east than i imagine, their, foggy, in hamilton

You Aucklander's are also so much more west than I imagine!
For comparison.. Hamilton's on the same longitude line with the most eastern point on Waihake Island.. and Raglan is on the same easting with Waitakere.

Manukau heads obs · Mon 01/05/2006 08:02

LOL, yeah, its the tilt of the upper NI that throws us out

jrj · Unread post by **jrj** » Mon 01/05/2006 08:36

Havelock North total for the 3 days 145mm.

C-Nimbus · Unread post by **C-Nimbus** » Mon 01/05/2006 08:55

possible heavy showers and T/S this arvo, with clear skies overhead this could be on the cards.

Saturday i must say was a flop! heard about 3 claps of thunder (distant) and basically got no rain out west...

Manukau heads obs · Mon 01/05/2006 09:04

some big rain totals in the hawkes bay !