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View Poll Results: Christchurch
A 7 12.73%
B 16 29.09%
C 14 25.45%
D 12 21.82%
F 6 10.91%
Voters: 55. You may not vote on this poll

 
 
Old 10-28-2011, 01:59 PM
 
Location: Wellington and North of South
4,986 posts, read 6,257,214 times
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Quote:
Originally Posted by ben86 View Post
41.6C in the morning - in Chch of all places - and 16C in the afternoon is surreal for anywhere in the world. Over here hot spells would generally end in a thundery breakdown, not generally the case there I imagine? I can just imagine people setting off in the morning for a day trip to the beach not checking the forecast and then later on not knowing what had hit them Do you know what it was like the day/night beforehand? Also, I notice Wellington has an very low record high - can't you get any Foehn setup on a northerly/northeasterly?
The heat was very well forecasted, spot on for the airport's max. of 40C. The city - nearer the coast - didn't reach its maximum till a little later, probably around noon.

The 3 previous days were all very hot in eastern areas, particularly in the southern half of the South Island. In Christchurch the 2 weekend days prior (the Monday immediately preceding was a little cooler at 29C or so) topped 33C despite light NNE sea breezes. The weak frontal passage that lowered the temperatures was also well forecasted.

There have been papers published by the then Met Service on the conditions that allowed a transport of very warm dry air directly from the Australian outback, in a layer above moister Tasman sea air. The developing drought and warm ground temperatures preceding this weather also contributed.

I made some comments on this in a thread in another forum:

Historic: New Zealand weather summary February 1973 - NZ Weather (http://www.nzweather.net/forum/topic/5837-historic-new-zealand-weather-summary-february-1973/page__pid__49533#entry49533 - broken link)

Wellington can get a weakish foehn effect from E/ENE/NE flows, but usually sunny skies are required as well to make the temperatures unusually high. All the summer month record highs have occurred either in this situation or under a stable anticyclone. Top value was 31.1C, though the adjoining Hutt valley has had records 2-2.5 C above that.
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Old 10-28-2011, 02:43 PM
 
Location: Bangkok, Thailand
2,688 posts, read 3,754,075 times
Reputation: 1494
Edit: Gah! Why did the formatting come out like this?

Here's the data for ChCh airport for that day:

Date(NZST) Tair(C) Tdew(C) 19730207:0000 18 16.3 19730207:0100 18 14.6 19730207:0200 17 15.3 19730207:0300 17 15.3 19730207:0400 18 16.3 19730207:0500 18 16.3 19730207:0600 18 16.3 19730207:0700 21 16.1 19730207:0800 24 17.6 19730207:0900 28.4 17.4 19730207:1000 34 14.8 19730207:1100 38 5.5 19730207:1200 39 4.1 19730207:1300 40 6.5 19730207:1400 40 6.5 19730207:1500 35 11.6 19730207:1600 22 13.4 19730207:1700 20 13 19730207:1800 17 11.5 19730207:1900 17 11.5 19730207:2000 16 10.4 19730207:2100 16 8.1 19730207:2200 16 8.1 19730207:2300 15 4.3 19730208:0000 14 5.6

It got hot early in the day but cooled off rapidly in the late afternoon. A more recent example occured earlier this year on the 6th of Feb -- the same day that a coastal town a couple of hours South of here recorded a record-breaking 41 C:

20110206:0000 18.2 16.5 20110206:0100 18.2 16.7 20110206:0200 18.2 16.7 20110206:0300 18.7 17 20110206:0400 19 17.1 20110206:0500 22 17.3 20110206:0600 23.2 17.6 20110206:0700 25.5 17.5 20110206:0800 28.1 18.8 20110206:0900 31.8 18.1 20110206:1000 33.4 15.8 20110206:1100 33.7 15.1 20110206:1200 34.2 14.6 20110206:1300 34.6 14.5 20110206:1400 34.6 14.3 20110206:1500 35.3 15 20110206:1600 34.5 14.8 20110206:1700 32.8 13.7 20110206:1800 32.3 12.1 20110206:1900 30.9 12 20110206:2000 28.3 12.3 20110206:2100 26.9 12.2 20110206:2200 27.1 12.2 20110206:2300 27.8 12.9 20110207:0000 27.6 12.7 20110207:0100 27.1 13.1 20110207:0200 17.8 15.5 20110207:0300 17.4 15.6 20110207:0400 17.2 14.5 20110207:0500 15.2 14.6 20110207:0600 14.3 13.9 20110207:0700 13.6 13.3 20110207:0800 13.5 13.2 20110207:0900 13.9 13.6

In this case it didn't get as hot as in '73 but it took a lot longer cooling off. In '73 we were back down to 20 C by 5 PM. This time we were still in the high 20s after midnight. I remember it vividly -- the water supply was out that night and I was thirsty! But I went for a lovely midnight stroll on the beach, so that was nice.

A similar temp was reached in Jan 2009, although I wasn't here for that:

Date(NZST) Tair(C) Tdew(C) 20090108:0000 23 9.8 20090108:0100 23 10.1 20090108:0200 21.4 10.2 20090108:0300 20 11.8 20090108:0400 19 10.8 20090108:0500 19.3 11.1 20090108:0600 19 12.3 20090108:0700 25 9.3 20090108:0800 26.6 10.7 20090108:0900 30 8.4 20090108:1000 32 8.9 20090108:1100 32.6 9.4 20090108:1200 33 9.1 20090108:1300 34 7.1 20090108:1400 35 6.3 20090108:1500 32 7 20090108:1600 32 8.9 20090108:1700 30.8 8.5 20090108:1800 30 7.8 20090108:1900 28 9.8 20090108:2000 27.6 8 20090108:2100 25 7.2 20090108:2200 24 5.9 20090108:2300 25.7 5.3 20090109:0000 22 6.7 20090109:0100 22 9.9 20090109:0200 19.6 9.5 20090109:0300 19 9.2 20090109:0400 19 10.3 20090109:0500 19.4 9.6 20090109:0600 21 8.3 20090109:0700 21 10.2 20090109:0800 20.4 10.5 20090109:0900 22 10.2

I was so disappointed that I missed the 2009 event (which at the time saw the 3rd highest high temp since records began in the 1860s -- to be pushed into fourth place this year) and I thought I might never see such weather in ChCh again. You can imagine my jubilation when we not only exceeded 2009's temp this year but also got hotter earlier and stayed hot longer than in '73. It was truly one of the greatest days of my life.

How does this compare with London heat waves like the 38 C in Aug '03?
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Old 10-28-2011, 03:13 PM
 
Location: Katy, Texas
992 posts, read 1,664,731 times
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Looks like a lot like the PNW, the worst weather in the world imo, just below subarctic and arctic...

D-/F.
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Old 10-28-2011, 04:36 PM
 
Location: Vancouver, BC
9,669 posts, read 10,970,575 times
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Quote:
Originally Posted by Asagi View Post
Looks like a lot like the PNW, the worst weather in the world imo, just below subarctic and arctic...

D-/F.
How can you compare Christchurch to arctic and subarctic climates when they can grow Canary Island Date Palms, Norfolk Island Pine and Jacaranda...
Try growing those unprotected long term in places like Oklahoma City or Atlanta.

http://www1.ccc.govt.nz/Planning/SiteLimitsOfTrees.asp (broken link)
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Old 10-28-2011, 05:37 PM
 
Location: Katy, Texas
992 posts, read 1,664,731 times
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Quote:
Originally Posted by deneb78 View Post
How can you compare Christchurch to arctic and subarctic climates when they can grow Canary Island Date Palms, Norfolk Island Pine and Jacaranda...
Try growing those unprotected long term in places like Oklahoma City or Atlanta.

Site Limitations Of Trees - Christchurch City Council (http://www1.ccc.govt.nz/Planning/SiteLimitsOfTrees.asp - broken link)
In terms of human comfort, there is no summer imo...eternal winter and cool spring
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Old 10-28-2011, 06:14 PM
 
Location: Wellington and North of South
4,986 posts, read 6,257,214 times
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Quote:
Originally Posted by ChesterNZ View Post
Edit: Gah! Why did the formatting come out like this?


It got hot early in the day but cooled off rapidly in the late afternoon. A more recent example occured earlier this year on the 6th of Feb -- the same day that a coastal town a couple of hours South of here recorded a record-breaking 41 C:
The thing to realise about the 1973 event was that the hot weather spell lasted longer overall - it started days earlier.

PS - the most sustained period of hot weather ever recorded in NZ was the 12 days of 10-21 January 1956, when in particular mid-Canterbury southwards and most particularly Central Otago were exceptionally warm. During that period the mean daily max at Alexandra was 32.2C (90F), with a maximum of 37.2C (99F) on the 21st, and 101.2F being recorded at Ashburton on the 19th, NZ's highest on record as of that date.

The monthly mean at Alexandra was 8.7F (4.8C) above normal, a "positive delta" that has not been exceeded in NZ (its oceanic nature means deviations above about 2.5C are quite uncommon).

Last edited by RWood; 10-28-2011 at 06:24 PM..
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Old 10-28-2011, 06:16 PM
 
Location: Wellington and North of South
4,986 posts, read 6,257,214 times
Reputation: 2375
Quote:
Originally Posted by Asagi View Post
Looks like a lot like the PNW, the worst weather in the world imo, just below subarctic and arctic...

D-/F.
That's a ridiculous statement, period.
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Old 10-28-2011, 07:51 PM
 
Location: USA East Coast
4,445 posts, read 8,277,554 times
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Quote:
Originally Posted by ben86 View Post
The site is designed to get mostly British people to emigrate to NZ so I suspect perhaps a slight agenda at play maybe? I've seen NZ tourism/emigration adverts on our TV before and they do tend to portray warm, sunny weather and subtropical-looking landscapes. The NZ climate IMO is 'like ours only better' but it would and should be, considering it's 10-15 degrees nearer the Equator.


Yes...I kind of gathered that...it seemed aimed at trying to build up the NZ climate. It is interesting that NZ is on the radar for British folks as a place to move to I guess.
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Old 10-28-2011, 08:13 PM
 
Location: Top of the South, NZ
15,858 posts, read 12,432,926 times
Reputation: 5054
Quote:
Originally Posted by wavehunter007 View Post
Yes...I kind of gathered that...it seemed aimed at trying to build up the NZ climate. It is interesting that NZ is on the radar for British folks as a place to move to I guess.
Historical and cultural ties would be the main reason to move to NZ. With a different pace of life , outdoorsy lifestyle and then climate I would think.

I didn't think it was a buildup, certainly nothing that wasn't true and the stats speak for themselves. It's very easy to meet UK immigrants here and they tend to do a good job of making the UK climate sound grim. I've have talked to some who thought that NZ was tropical, which seems odd, but I guess only some of us are climate geeks.
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Old 10-28-2011, 08:15 PM
 
Location: Katy, Texas
992 posts, read 1,664,731 times
Reputation: 435
Quote:
Originally Posted by RWood View Post
That's a ridiculous statement, period.
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