Depression Sunday 29th July onwards

Gary McConnochie · Unread post by **Gary McConnochie** » Mon 30/07/2007 07:37

22ml recorded here in Rolleston. Rain appears to be intensifying again.

Lawrence · Unread post by **Lawrence** » Mon 30/07/2007 07:44

I suggest you get the boats out any where south of Timaru,looks like your going to get the worst of this one.It looks really bad for down there.

gllitz · Unread post by **gllitz** » Mon 30/07/2007 07:46

Manukau heads observer wrote:i see burwood in chch has 38mm...all falling overnight (since 8pm ish?)
and the rain radar shows more to come still

Yeah, there was a brief lull in the rain, but has started back up again (just like the radar has indicated) and looks like it will happen for a few more hours yet...
NOT looking forward to dropping the kids off this morning in this yuck....

(sigh...if it had only been cold enough.....all those "waisted" rain drops...........

...)

EDIT: (aside...radar loops are really showing how a low is forming off the coast and moving SSW down the SI east coast...kinda cool!)

Andrew Massie · Unread post by **Andrew Massie** » Mon 30/07/2007 08:24

Wierd.. I caught 60mm in my rain gauge from 8:30pm last night to 7:30 this morning.. Heavier closer to the east coast?

Witnessed an accident due to idiotic teen "drifting" on the greasy roads this morning <sigh>, no injuries, but unnecessary BS. The other driver was suitably livid.

Gary McConnochie · Unread post by **Gary McConnochie** » Mon 30/07/2007 08:38

Andrew Massie wrote:Wierd.. I caught 60mm in my rain gauge from 8:30pm last night to 7:30 this morning.. Heavier closer to the east coast?]

We had a half hour of hevy rain at about 2am after that it has just been a steady gentle rain here.

Looking at some of the rain totals from around ChCh it would appear more rain has fallen around the coast.

spwill · Unread post by **spwill** » Mon 30/07/2007 10:12

Lovely morning here, 15C, but it wont last.
Cb clouds and some Thunderstorms out to the West/ NW of Northland/ Auckland currently.

gopolks · Unread post by **gopolks** » Mon 30/07/2007 11:04

"Well we have had rain, so I think this station is a little inaccurate"

Click Here
Temperature: 8.7Â°C Warmer 0.3Â°C than last hour.
Heat Index 8.7Â°C
Wind Chill 6.5Â°C

Humidity: 92 %
Dewpoint: 7.4Â°C
Wind Speed: 17.8 km/h Wind fromWSW
Gust Speed: 18.5 km/h
Gust Last Hour: 30.6 kmh SW
Barometer: 997.3 hPaFalling 0.30 hPa/hour.
Today's Rain: 0.0 mm
Days with no rain: 0 days
Sunshine Today: 00:00
Time of Last Lightning: 09:54:48 2007/07/30
Last strike recorded: 880 KM @ 4Â°

Lawrence · Unread post by **Lawrence** » Mon 30/07/2007 11:10

gopolks wrote:"Well we have had rain, so I think this station is a little inaccurate"

Proberly spiders in your rain bucket,happens to me as well,the small ones are the worst.

03Stormchaser · Unread post by **03Stormchaser** » Mon 30/07/2007 11:10

gopolks wrote:"Well we have had rain, so I think this station is a little inaccurate"

Click Here
Temperature: 8.7Â°C Warmer 0.3Â°C than last hour.
Heat Index 8.7Â°C
Wind Chill 6.5Â°C

Humidity: 92 %
Dewpoint: 7.4Â°C
Wind Speed: 17.8 km/h Wind fromWSW
Gust Speed: 18.5 km/h
Gust Last Hour: 30.6 kmh SW
Barometer: 997.3 hPaFalling 0.30 hPa/hour.
Today's Rain: 0.0 mm
Days with no rain: 0 days
Sunshine Today: 00:00
Time of Last Lightning: 09:54:48 2007/07/30
Last strike recorded: 880 KM @ 4Â°

Possible that there rain gauge isnt working at present, other than that the station seems to be working fine.

We have had 51mm here from this event.

Willoughby · Unread post by **Willoughby** » Mon 30/07/2007 11:17

He's using the NZ standard for a 9am reset time.

You're slipping 03!

Fujita Phil · Unread post by **Fujita Phil** » Mon 30/07/2007 11:36

I've had 47mm for the event so far. But getting heavier by the hour, about 10mm in the last hour alone.

The Leith is picking up volume and speed. There will be a student in it sometime today no doubt

Andrew Massie · Unread post by **Andrew Massie** » Mon 30/07/2007 11:39

Fujita Phil wrote:The Leith is picking up volume and speed. There will be a student in it sometime today no doubt

That's why it floods, isn't it? Student displacement of water?

03Stormchaser · Unread post by **03Stormchaser** » Mon 30/07/2007 12:18

Foggy wrote:He's using the NZ standard for a 9am reset time.
You're slipping 03!

XD Heck I dont even know what weather station we are even talking about!!

NZstorm · Unread post by **NZstorm** » Mon 30/07/2007 12:23

What an active front this has been. Given most of the country a good soaking.

Fortunately the front has been on the move thus far and not had the chance to produce any real flooding issues yet.

Lawrence · Unread post by **Lawrence** » Mon 30/07/2007 12:41

NZstorm wrote:What an active front this has been. Given most of the country a good soaking. Fortunately the front has been on the move thus far and not had the chance to produce any real flooding issues yet.

You can say that again,I think though that it has just about ran out steam now and should become stationary near Dunedin,as I stated this morning I think they may get the worst of it.

gllitz · Unread post by **gllitz** » Mon 30/07/2007 13:02

gopolks wrote:"Well we have had rain, so I think this station is a little inaccurate"

Click Here
Temperature: 8.7Â°C Warmer 0.3Â°C than last hour.
Heat Index 8.7Â°C
Wind Chill 6.5Â°C

Humidity: 92 %
Dewpoint: 7.4Â°C
Wind Speed: 17.8 km/h Wind fromWSW
Gust Speed: 18.5 km/h
Gust Last Hour: 30.6 kmh SW
Barometer: 997.3 hPaFalling 0.30 hPa/hour.
Today's Rain: 0.0 mm
Days with no rain: 0 days
Sunshine Today: 00:00
Time of Last Lightning: 09:54:48 2007/07/30
Last strike recorded: 880 KM @ 4Â°

Uhhh, no....you are just reading the station readings just after he has reset them for the day...from memory he does it after 9 am, but can't remember which...you should email and find out!
If you explore on his site a wee bit more, rather than just reading that page, you will see he has recorded 43mm from this event...I wouldn't call his site inaccurate, either...he is very meticulous, from what I have seen.

spwill · Unread post by **spwill** » Mon 30/07/2007 13:12

Clouding up here now 17C, showers about to move in from the NW.

Manukau heads obs · Mon 30/07/2007 13:27

nice CB coming onto me now

Manukau heads obs · Mon 30/07/2007 13:31

tornadic potential in this CB

nice, big flash of lightning, 1 second to the thunder

some very small hail too

TonyT · Unread post by **TonyT** » Mon 30/07/2007 13:43

29mm here, most of that falling between 10pm and 1am. Sun's out now, 15deg, drying out rapidly.

NZstorm · Unread post by **NZstorm** » Mon 30/07/2007 13:54

Looking very dark to NW (cbs) Calm 17C here.

spwill · Unread post by **spwill** » Mon 30/07/2007 14:01

Quite a few strikes Wellsford/Kaipara area.
Day time heating adding to the instability today.

NZstorm · Unread post by **NZstorm** » Mon 30/07/2007 14:13

Heavy rain and a little bit of hail here now!

spwill · Unread post by **spwill** » Mon 30/07/2007 14:21

Lightning flash/Thunder over central Auckland now with this heavy shower.

sw_windbow · Unread post by **sw_windbow** » Mon 30/07/2007 14:27

sw_windbow wrote:

Unlike the sodden North there's not much heavy rain in these parts - ever - and I'm praying like a drought-stricken farmer that it does eventuate.

RWood wrote:"Ever"? I assume you're not serious.

Slight exaggeration there, but only slight. Dunedin does get quite spectacular downpours, like the one in Feb '05 that broke the roof at Fisher & Paykel's factory, and then flooded buildings in Lower Rattray St, and many other parts of the city.

There are the more sustained events too, like in April last year there was the quite considerable event that blew out Silverstream and flooded Mosgiel. The Leith on that occasion remained mostly within its banks.

But sustained heavy rain is uncommon. I did a quick check of the rainfall stats for Mussleburgh over the last 81 years. It would appear the monthly average rainfall is around 50mm. By my calculations there has been on average one month every 3 years and 3 months where the total rainfall exceeds 150mm. I counted a total of 25 of those months over the 81 years. I saw only 8 or 9 months where the total exceeded 200mm. March and April 1968 were exceptionally wet with 479mm between them. The highest total I found (though I wasn't looking very hard) was for the month of April 1923 with 294mm. I suspect that might have been the month of the great Leith Flood that inundated much of North Dunedin and bought a collosal volume of rocks and debree into the lower stretches of the stream bed.

Comparing Dunedin's monthly rainfall totals with almost any other part of New Zealand, and in particular the Northern areas, where events of 100mm over 24 hours can be expected every year, if not every 6 months, I think it is fair to say Dunedin doesn't get much heavy rain. This event so far hasn't been particularly heavy, but still looks like it might catapult July's total to one of the highest of the year. And the month includes 4 weeks of more or less dry weather!

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