The summer ts can be harder to forecast as you are needing the convective temperature to be met by heating. Some cloud cover can throw a convective forecast out in summer.shovelopikis wrote: No doubt about that, but its more of how severe warnings were out where the bulk of the strikes (estimating a good 80%) were in squalls off shore
are winter TS harder to pinpoint in compared to summer convergence in NZ?
General April Weather
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These topics are a read-only archive and may be subject to out-of-date information.
For today's weather discussion head to: New Zealand Weather & Climate
These topics are a read-only archive and may be subject to out-of-date information.
For today's weather discussion head to: New Zealand Weather & Climate
- NZstorm
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Re: General April Weather
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Re: General April Weather
Lovely day here, sunny 19C with hardly any wind.
By the way, for iPhone/ipad owners, there's a lightning photography app going free (today only) on the iTunes App Store https://itunes.apple.com/us/app/ilightn ... 21890?mt=8. It claims to be able to detect and capture lightning strikes. I have downloaded and I'll have to give it a go sometime when we get a thunderstorm
By the way, for iPhone/ipad owners, there's a lightning photography app going free (today only) on the iTunes App Store https://itunes.apple.com/us/app/ilightn ... 21890?mt=8. It claims to be able to detect and capture lightning strikes. I have downloaded and I'll have to give it a go sometime when we get a thunderstorm
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Re: General April Weather
April values for my station:
Ave min: 9.7C
Ave max: 16.8C
Mean: 12.6C
Min: 2.4C on 27th
Max: 23.6C on 2nd
Rain: 172.6mm on 16 days with 40.8mm on 29th (YTD 345mm). Both new month and daily records for April.
Ave min: 9.7C
Ave max: 16.8C
Mean: 12.6C
Min: 2.4C on 27th
Max: 23.6C on 2nd
Rain: 172.6mm on 16 days with 40.8mm on 29th (YTD 345mm). Both new month and daily records for April.
- David
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Re: General April Weather
The main April figures for my station:
Code: Select all
Avg temp 17.6 °C
Avg daily min 13.8 °C
Avg daily max 22.2 °C
Lowest temp 8.4 °C
Highest temp 24.9 °C
Total rain 112 mm
Wettest day 50 mm
YTD rain 208 mm
- Nev
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Re: General April Weather
An extraordinarily warm, wet and cloudy April overall, the exceptions being above normal sunshine for the north of the North Island and relatively cooler temps in inland Canterbury.
Some preliminary April 2014 temp and rainfall figures for the main centres:
Note that NIWA's Riccarton, Chch site recorded 224mm for the month (including 76mm for the 17/18 event and 86mm for the 28/29 event), which is about 485% of nearby Chch Garden's April normal, and considerably more than Chch Aero's tally.
Some preliminary April 2014 temp and rainfall figures for the main centres:
Code: Select all
April 2014 Average Temps, Rainfall and departures from their 1981-2010 normals ℅ NIWA
Site T-max °C T-min °C T-mean °C Rainfall mm
Auckland, Mangere 21.8 +1.7 14.7 +2.3 18.2 +2.0 129 153%
Auckland Aero 21.7 +1.7 14.3 +1.6 18.0 +1.7 108 127%
Tauranga Aero 21.6 +1.6 14.0 +2.7 17.8 +2.2 225 187%
Hamilton Aero 21.5 +1.6 10.8 +2.4 16.2 +2.0 162 185%
Hamilton, Ruakura 22.0 +2.1 11.5 +2.5 16.8 +2.3 135 162%
Wellington, Kelburn 17.2 +0.6 12.2 +1.5 14.7 +1.0 263 310%
Christchurch Aero 15.8 -1.6 9.2 +2.7 12.5 +0.6 162 367%
Dunedin, Musselburgh 14.9 -0.4 9.6 +1.4 12.2 +0.5 100 196%
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Re: General April Weather
+Nev wrote:An extraordinarily warm, wet and cloudy April overall, the exceptions being above normal sunshine for the north of the North Island and relatively cooler temps in inland Canterbury.
Some preliminary April 2014 temp and rainfall figures for the main centres:
Note that NIWA's Riccarton, Chch site recorded 224mm for the month (including 76mm for the 17/18 event and 86mm for the 28/29 event), which is about 485% of nearby Chch Garden's April normal, and considerably more than Chch Aero's tally.Code: Select all
April 2014 Average Temps, Rainfall and departures from their 1981-2010 normals ℅ NIWA Site T-max °C T-min °C T-mean °C Rainfall mm Auckland, Mangere 21.8 +1.7 14.7 +2.3 18.2 +2.0 129 153% Auckland Aero 21.7 +1.7 14.3 +1.6 18.0 +1.7 108 127% Tauranga Aero 21.6 +1.6 14.0 +2.7 17.8 +2.2 225 187% Hamilton Aero 21.5 +1.6 10.8 +2.4 16.2 +2.0 162 185% Hamilton, Ruakura 22.0 +2.1 11.5 +2.5 16.8 +2.3 135 162% Wellington, Kelburn 17.2 +0.6 12.2 +1.5 14.7 +1.0 263 310% Christchurch Aero 15.8 -1.6 9.2 +2.7 12.5 +0.6 162 367% Dunedin, Musselburgh 14.9 -0.4 9.6 +1.4 12.2 +0.5 100 196%
Some commonality with April 1938, but that one had some massive rainfalls in Coromandel and Hawkes Bay. Ch'ch Aero had only 69 hours of sunshine as at the 29th, so the Aero low of 95 in 1968 is shattered, and the Gardens low of 80 in 1938 will also be beaten. So its total won't even be 50% of the average - a rare event in NZ's sunshine climatology. In 1938, Waimate logged only 63 hours - followed by 180 in May!
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Re: General April Weather
The time has to come soon when the chch airport readings are recognised to be not representative of Chch city. Its rural vs urban and removed enough from the various effects of the coast and port hills
Christchurch Rocks
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Re: General April Weather
Quite a large part of Christchurch is in a similar climate zone to the Airport is it not. Its not like Dunedin where a large part of the city is in the coastal and hills climate areas.Razor wrote:The time has to come soon when the chch airport readings are recognised to be not representative of Chch city. Its rural vs urban and removed enough from the various effects of the coast and port hills
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General April Weather
Hamilton airport is the same and I'm sure it's the same all over the world. Generally airports are on the outer edge of cities.
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Re: General April Weather
The NIWA monthly stats. reports give summaries for 4 Ch'ch sites, plus a goodly number in the surrounding regions.
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Re: General April Weather
Totally agree Razor! This has been an underlying issue that has been bothering me for a while. Consistently higher rainfall totals are recorded throughout much of CHCH in comparison to the airport station. It really is not reflective of the majority of the city. The station should be far more central, the airport is on the outskirts really in a way.spwill wrote:Quite a large part of Christchurch is in a similar climate zone to the Airport is it not. Its not like Dunedin where a large part of the city is in the coastal and hills climate areas.Razor wrote:The time has to come soon when the chch airport readings are recognised to be not representative of Chch city. Its rural vs urban and removed enough from the various effects of the coast and port hills
Reporting Live from Southern Christchurch
Leighton Thomas
2014 Rainfall: Jan: 21mm Feb: 76mm March: 170mm April: 201mm YTD: 468mm
Leighton Thomas
2014 Rainfall: Jan: 21mm Feb: 76mm March: 170mm April: 201mm YTD: 468mm
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Re: General April Weather
No, its often different at the airport- ie less effects of the easterly, more NW effects, and on a number of occasions the Peninsula sucks more significant weather across the CBD, but not as far as the western fringe of the city where the airport is. this is why Riccarton NIWA and the city and southern/ eastern suburbs received so much more rain last week- up to 50mm morespwill wrote:Quite a large part of Christchurch is in a similar climate zone to the Airport is it not. Its not like Dunedin where a large part of the city is in the coastal and hills climate areas.Razor wrote:The time has to come soon when the chch airport readings are recognised to be not representative of Chch city. Its rural vs urban and removed enough from the various effects of the coast and port hills
Christchurch Rocks
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Re: General April Weather
Yeah, it can be NW at the airport whereas a NE can be blowing in town.
JohnGaul
NZThS
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Re: General April Weather
Perhaps RWood could provide us with some climate averages from various locations across Chch.
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Re: General April Weather
There's Bob Crowder's weather records from the 1960s to the present day from his site in Cashmere, which would be very accurate.
JohnGaul
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Re: General April Weather
Don't if it will be of much help, but here are some rainfall averages for 4 periods (51-80,61-90,71-00,81-10), in that order.
Rangiora 735 727 756 688
Ch'ch Aero 640 616 630 594
Waimak. bridge 646 624 598 523 (latter looks low!)
Prebbleton 701 (-) 654 632
Gardens 668 644 653 618
Shirley 615 578 587 559
Bromley 623 593 602 (-)
Mt Pleasant 702 681 699 655
Burnham 683 643 646 639
Rangiora 735 727 756 688
Ch'ch Aero 640 616 630 594
Waimak. bridge 646 624 598 523 (latter looks low!)
Prebbleton 701 (-) 654 632
Gardens 668 644 653 618
Shirley 615 578 587 559
Bromley 623 593 602 (-)
Mt Pleasant 702 681 699 655
Burnham 683 643 646 639
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Re: General April Weather
Shirley thats a bit on the low side
Also not as much variation overall from airport
To inner city as suggested
Also not as much variation overall from airport
To inner city as suggested
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Re: General April Weather
Thanks RWood.
Variation across Christchurch will show up better with temperature, the Airport is in a cooler zone ( for mean temperatures)
Variation across Christchurch will show up better with temperature, the Airport is in a cooler zone ( for mean temperatures)
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Re: General April Weather
There are only 3 sites quoted for temperature means in the NIWA tables, unless I missed some - (mean annual Tmax, mean annual Tmin here): Ch'ch Aero 16.9 6.3; Ch'ch Gardens 17.2 7.3; Mt Pleasant 16.2 9.2. The aero-city difference is greatest in winter (at least 0.8C in July).spwill wrote:Thanks RWood.
Variation across Christchurch will show up better with temperature, the Airport is in a cooler zone ( for mean temperatures)
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Re: General April Weather
Thanks RWood- this does confirm to me a bit of evidence of an increasing gradient of rainfall if you follow accross town from from particularly Prebbleton to Mt Pleasant. Rangiora is interesting too as an outlier (both in the physical and statistical sense!)RWood wrote:Don't if it will be of much help, but here are some rainfall averages for 4 periods (51-80,61-90,71-00,81-10), in that order.
Rangiora 735 727 756 688
Ch'ch Aero 640 616 630 594
Waimak. bridge 646 624 598 523 (latter looks low!)
Prebbleton 701 (-) 654 632
Gardens 668 644 653 618
Shirley 615 578 587 559
Bromley 623 593 602 (-)
Mt Pleasant 702 681 699 655
Burnham 683 643 646 639
Shirley I guess is a bit further north- as I said earlier, i really do see a belt accross wthe Southern / SW side of town where the Port Hills ramp events up, while the rest can experience that famous Port Hills Rainshadow ie Shirley
Christchurch Rocks
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Re: General April Weather
well I never--- turns out where there was smoke there was a blazing inferno. ChCh Aero figures underreported!
http://www.stuff.co.nz/the-press/news/y ... our-months
http://www.stuff.co.nz/the-press/news/y ... our-months
Christchurch Rocks
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Re: General April Weather
Have changed the story now and added a bit at the bottom, sounds like M/S don't even know what our avg yearly rainfall is.
"* The MetService provided an incorrect rainfall figure in a previous story published on press.co.nz. It said the airport, on average, received about 443mm of rain a year. The correct figure is 620mm. "
"* The MetService provided an incorrect rainfall figure in a previous story published on press.co.nz. It said the airport, on average, received about 443mm of rain a year. The correct figure is 620mm. "
- Nev
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Re: General April Weather
Here's NIWA's preliminary, 'April 2014 National Climate Summary'.
The national average temp of 14.5C was 1.1C above normal.
The month's highest temp of 29.6C was recorded at Whakatane on the 7th, which was also its highest daily T-max for the year so far.
The lowest of temp of -4.2C was yet again recorded at Pukaki Aero on the 29th.
Too many other record or near record temps and rainfall to mention…
The national average temp of 14.5C was 1.1C above normal.
The month's highest temp of 29.6C was recorded at Whakatane on the 7th, which was also its highest daily T-max for the year so far.
The lowest of temp of -4.2C was yet again recorded at Pukaki Aero on the 29th.
Too many other record or near record temps and rainfall to mention…
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Re: General April Weather
Still not really correct - the 1981-2010 mean is 594mm, though the all-records mean from 1943 is about 620 mm (624 mm for 1943-2011)melja wrote:Have changed the story now and added a bit at the bottom, sounds like M/S don't even know what our avg yearly rainfall is.
"* The MetService provided an incorrect rainfall figure in a previous story published on press.co.nz. It said the airport, on average, received about 443mm of rain a year. The correct figure is 620mm. "