North Island 19 -21 st July - dooozey!

Willoughby · Unread post by **Willoughby** » Wed 19/07/2006 23:19

Manukau heads observer wrote:a relatively tight low center has developed near us here....on the front..to the south of us now...the wind has gone W and increased surprisingly quickly....and the rain has eased...31mm now...

Wasn't expecting the pressures to drop below 1000mb today... and still dropping... wind tending southerly now... looks like the BoP is getting hit by fresh ENE.

35mm so far today since 9am.. the moisture is certainly there for thunder.. but there has been no trigger.

Edit: May see thunderstorms develop north of Hamilton tomorrow with digging of an upper trough in action at the moment way out west

Manukau heads obs · Wed 19/07/2006 23:49

46mm recorded in waiuku....which caught more rain running down the coast than me here....

Manukau heads obs · Thu 20/07/2006 07:19

and look at that, its now a flow blown new low center that developed on the front...and is now off HB

borris89 · Unread post by **borris89** » Thu 20/07/2006 10:41

994mb around about here in the bay. persistent rain over night but the clouds are starting to break up. plenty of moisture, 93%, so if the sun gets thru heavy showers are a could be i spose.

Razor · Unread post by **Razor** » Thu 20/07/2006 10:56

Snow to 300m in the North island forecast now

Manukau heads obs · Thu 20/07/2006 12:45

some very beefy showers here passing through

C-Nimbus · Unread post by **C-Nimbus** » Thu 20/07/2006 12:55

yes some weak Cb's over newmarket

generated a few showers, apparently there quite heavy out west

spwill · Unread post by **spwill** » Thu 20/07/2006 16:14

Only weak shower cloud over the North today, there was a storm this afternoon in the Bay Of Plenty (off shore by the looks).

Willoughby · Unread post by **Willoughby** » Thu 20/07/2006 18:08

Impressive T/Cu on the way up to Auckland today, over the Bombays.. i'm sure I could see mammatus just under the arch of a Cb looking west over the Manukau Harbour after midday. A beautiful sunset over Hamilton on the return to cap it off with the sun shining through a dying Cb off Port Waikato

Shepherds Valley WX · Thu 20/07/2006 18:21

Constant rain all day here, very windy in Wellington city itself, but not bad here in Upper Hut where we are sheltered from the cold Southerly. Rain for the day 18.4mm following 24.8mm yesterday. Baro 999.4 and steady with a cool temperature of 8.1 C.

mikestormchaser · Unread post by **mikestormchaser** » Thu 20/07/2006 18:25

NZstorm wrote:
tropo is at about 10,000m but i dont know if thats enuff height for T/S??

10,000m would be a high topped thunderstorm for this time of year. Generaly NZ winter thunderstorm tops are around the 7 to 9000m mark.

hey NZstorm. You sound like you know alot about storms I was wondering, How high does an average thunderstorm cloud go? and compared to usa storms?

NZstorm · Unread post by **NZstorm** » Thu 20/07/2006 19:06

hey NZstorm. You sound like you know alot about storms I was wondering, How high does an average thunderstorm cloud go? and compared to usa storms?

In NZ around 9 or 10,000m. In the right situation in summer, cb tops can reach 13000m. In USA cb tops are generaly higher and the everage supercell gets to about 18,000m.

mikestormchaser · Unread post by **mikestormchaser** » Thu 20/07/2006 19:25

In NZ around 9 or 10,000m. In the right situation in summer, cb tops can reach 13000m. In USA cb tops are generaly higher and the everage supercell gets to about 18,000m.[/quote]

cheers for that NZstorm

Razor · Unread post by **Razor** » Fri 21/07/2006 09:38

Wellington is getting a friggin hammering.

A house is about to fall on 24 others in Eastbourne and the sleet/snow is coming this arvo...

C-Nimbus · Unread post by **C-Nimbus** » Fri 21/07/2006 10:11

Razor wrote:Wellington is getting a friggin hammering.

A house is about to fall on 24 others in Eastbourne and the sleet/snow is coming this arvo...

Shepherds Valley WX · Fri 21/07/2006 10:50

We were working down by Eastbourne this morning and saw the house in question. The whole street was cordoned off with fire crews everywhere, looked like most of the street was evacuated as there were heaps of residents cars parked all along the main harbour road.... was still raining and very windy down there but it seems to be easy now.... I hope so for the homeowners sake!

Wildland · Unread post by **Wildland** » Fri 21/07/2006 11:45

It's on again, off again here in Tawa, north of Wellington, this morning.
Temeprature wandering back and forth between 5 and 7 C.
Alternating brief sunny spells, showers and some wild squalls firing small hail about - but it doesn't sit on the ground for long. And the strong southerly blasts on through...

Re the Eastbourne thing - It seems a slip knocked a house off its piles, and it was in danger of collecting another two houses if it took off. 1 + 2 = domino effect? Hence they evacuated about 24 houses just to be sure. Not the sort of day that I'd want to be chased out of the house!

Soil moisture levels are high. Here in Tawa we've had 196 mm of rain so far this month - nowhere near as high as some areas, but the steady on-going rain (9 mm on the 19th, 21 mm yesterday) isn't allowing the ground to dry out. We've only had two days without rain since the 11th.

That explains why we're getting the landslips at Horokiwi (which keeps disrupting SH2), Eastbourne etc.

It must be winter. I wonder what this afternoon will bring...

spike_01 · Unread post by **spike_01** » Fri 21/07/2006 14:22

Snow on the Tararuas again...

ScottyD · Unread post by **ScottyD** » Fri 21/07/2006 14:31

We need more Wellington updates. Is there anyone in the Wellington region that can let us know what's happening? Hail, sleet showers?

spike_01 · Unread post by **spike_01** » Fri 21/07/2006 14:39

Only a short thread...

http://www.zillion.co.nz/community/foru ... ead/13893/

Willoughby · Unread post by **Willoughby** » Fri 21/07/2006 14:40

Temps ranging between 5 and 7Â°C across the city.. so that would suggest snow flurries to 300m.. but the dewpoint is a little high. Southerly moving through a fair notch..

EDIT: I see Turoa has had 15cm new snow overnight.. bringing thier average snow depth to 230cm.. already!

Looks like this high pressure system moving onto us will send is persistent dry sw/southerlies.. until the developing low in the Tasman sends a change of warm northeasterlies over NZ.

Wildland · Unread post by **Wildland** » Fri 21/07/2006 15:07

Weather in Tawa still alternating between sunny spells, showers and short hail showers.
The southerly is still what we call "lazy" - too lazy to go round you, it just cuts straight through! And bitterly cold if you get caught out in one of the squalls.

More hail clattering on the roof as I type this, but it's small stuff and won't last long.

Temperature got to 8 C briefly during one of the sunny spells at 12:58, but its back to drifting between 5 and 7 C. 7 mm of rainfall so far today.

A dismal old day.

ScottyD · Unread post by **ScottyD** » Fri 21/07/2006 15:22

Thanks for the update. Hopefully you get a few sleety showers through. Would be nice to see a few flakes in the higher suburbs. Unfortunately the more eastern areas such as Tawa and Porirua don't usually see much as most of the activity generally sweeps further west.

Willoughby · Unread post by **Willoughby** » Fri 21/07/2006 17:38

Don't you mean Tawa and Porirua are west.. and it sweeps further east?

Michael · Unread post by **Michael** » Fri 21/07/2006 18:17

Snow falls on the hills towards Eastbourne and north of the Hutt in the hills when it does fall