Low to end week

NZstorm · Unread post by **NZstorm** » Tue 17/07/2007 19:47

Another shallow low pressure system will cross the upper North Island Friday into the weekend. With the upper air remaining cold rainfall in this system will be convectively enhanced with a good chance of thunder over northern regions given forecast 500mb temps of -25C.

A strong onshore flow for eastern areas of the North Island over the weekend means yet more heavy rain is on the cards. Should also be further snowfall in the North Island ranges from this sytem.

spwill · Unread post by **spwill** » Tue 17/07/2007 20:08

Looks like the last system in this run of stormy weather for the North Island.

GraemeWi · Unread post by **GraemeWi** » Tue 17/07/2007 20:18

Oh yay! I'm shifting house in West Auckland on Friday, so of all days for it to be wet...

NZstorm · Unread post by **NZstorm** » Wed 18/07/2007 20:58

Looks like this system will be weaker than the one earlier in the week given less moisture. Looks like high pressure will build fairly quickly onto the NI early week.

Manukau heads obs · Fri 20/07/2007 12:07

a big CB slowly approaching the auckland area at the moment
the anvil goes from one horizon to the other now...reminds me of the midwest ones

(but its actualy not all that active this CB)
update: its weakening as it approaches us

Manukau heads obs · Fri 20/07/2007 15:21

picy of CB to my southwest

Manukau heads obs · Fri 20/07/2007 15:35

a bit later...

NZstorm · Unread post by **NZstorm** » Fri 20/07/2007 20:06

Nice shots of a distant cb there Brian. I noticed that cloud too. The NZWP soundings have looked a bit unstable for the last fews days.

Latest computer model has warmed the air a tad over the upper North Island tomorrow which is nuisance as it could be the difference between thunder and no thunderstorm for us.

Manukau heads obs · Fri 20/07/2007 20:20

that developing jet stream to our north though I think should help things along nicely

good spot for CB's off raglan there

Willoughby · Unread post by **Willoughby** » Sat 21/07/2007 00:01

Noticed early this morning there were a few strikes recorded around Tauranga as showers pushed through there.

Hardly any wind at all today, highest gust was 15km/h.. led to some nice lazy towering cumulus about.

Good chances for thunder over Northland tomorrow afternoon, with steepening lapse rates.

NZstorm · Unread post by **NZstorm** » Sat 21/07/2007 10:37

Grey skies with heavy showers this morning in Auckland. Would need to see a clearance with daytime heating to get thunder here this afternoon I think. Met Service have high risk for Auckland/Waikato today.

NZstorm · Unread post by **NZstorm** » Sat 21/07/2007 14:43

Latest computer model has warmed the air a tad over the upper North Island tomorrow

Yep, 500mb temp last night was -24.3 and at midday today -21.7C.

spwill · Unread post by **spwill** » Sat 21/07/2007 15:55

Sat pic shows a line of active Cb cloud moving our way from the W/NW, may spoil the Rugby tonight.
I see there are a few Thunderstorms in the line currently.

Manukau heads obs · Sat 21/07/2007 16:30

oh, yes, i am picking up lightning strikes to my NW

spwill · Unread post by **spwill** » Sat 21/07/2007 18:17

There's a storm in the Kaipara area, looks like just a burst heavy rain for us.

Manukau heads obs · Sat 21/07/2007 18:56

squall just getting us now

C-Nimbus · Unread post by **C-Nimbus** » Sat 21/07/2007 19:18

Just observed a nice bit 'o' lightnin' with a loud rumble of thunder with it.

Rickys tracker shows it out by the heads somehwere give or take...

NZstorm · Unread post by **NZstorm** » Sat 21/07/2007 19:22

Very heavy rain here now. Eden park is a stone throw from me so some people getting wet over there. That slight warming trend in the upper air today dampened down our thunderstorm chances. The colder air mass moves in tomorrow but with stabilising conditions.

NZ Thunderstorm Soc · Sat 21/07/2007 19:24

C-Nimbus wrote:Just observed a nice bit 'o' lightnin' with a loud rumble of thunder with it.

Rickys tracker shows it out by the heads somehwere give or take...

Good on yer

Interesting to see what happens when that warmer air meets the colder air now going up the South Island.
Kaitaia was 19^&C today

JohnGaul
NZTS

NZstorm · Unread post by **NZstorm** » Sat 21/07/2007 19:28

Big flash and rumble here now!

That lightning strike not that far away i think.

NZstorm · Unread post by **NZstorm** » Sat 21/07/2007 19:30

and another.

C-Nimbus · Unread post by **C-Nimbus** » Sat 21/07/2007 19:31

.....and again!!

ooooh goodie gum drops

and another.......come on mother nature show us ya goods!

Manukau heads obs · Sat 21/07/2007 19:33

lightning and thunder occasionaly here

NZstorm · Unread post by **NZstorm** » Sat 21/07/2007 19:35

Met Service get full marks for the high risk prediction.

Michael · Unread post by **Michael** » Sat 21/07/2007 19:52

Lightening here too the W with rumbling across thunder and rain of course

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