NZ Weather Forum

jamie wrote:I see MetService are picking -4 here tonight. Should be our best frost of the year.

Orion wrote:My flight from Auckland to Christchurch this afternoon was quite bumpy at times: message from the Flight Deck was of an unforecast jetstream at around 30,000'.

tunster wrote:

Orion wrote:My flight from Auckland to Christchurch this afternoon was quite bumpy at times: message from the Flight Deck was of an unforecast jetstream at around 30,000'.

Was that Air NZ 535?

MetService July 2017 Summary

Frequent lows were centred over New Zealand during July. Not surprisingly, the month was unusually volatile and very wet for most regions, excluding the West Coast of the South Island. Extreme weather events were characteristic of the month of July. An unusually cold outbreak on July 12/13 produced snowfalls to low levels across the South Island and also brought heavy snow to the lower and central North Island. Flooding rains occurred across the eastern South Island on the 21st, and State of Emergency declarations were issued for Otago, including Dunedin and Oamaru, as well as for Timaru and Christchurch.

July 2017 Average Temps, Rainfall, Sunshine and departures from 1981-2010 normals ℅ NIWA

Site                     T-max °C      T-min °C      T-mean °C     Rain mm      Sun hrs

Auckland, Mangere       15.0  +0.5     8.0  +0.7    11.5  +0.6    190  138%    126   96%
Auckland Aero           14.6  +0.3     7.8  +0.3    11.2  +0.3    178  134%
Tauranga Aero           14.4  -0.1     6.3  +0.2    10.3   0.0    124   96%    n/a   n/a
Hamilton Aero           13.9  +0.1     4.2  +0.6     9.0  +0.3    160  124%
Wellington, Kelburn     11.5  +0.1     6.4  +0.1     8.9   0.0    230  168%     97   81%
Christchurch Aero       10.0  -0.9     1.0  +0.4     5.5  -0.3    159  246%     93   73%
Dunedin, Musselburgh     9.5  -0.5     2.6  -0.5     6.1  -0.4    157  274%    100   91%
Greymouth Aero          11.7  -0.4     4.4  +0.4     8.1   0.0    229  116%    128  119%

Orion wrote: Yes, why do you ask?

Nev wrote:

MetService July 2017 Summary

Frequent lows were centred over New Zealand during July. Not surprisingly, the month was unusually volatile and very wet for most regions, excluding the West Coast of the South Island. Extreme weather events were characteristic of the month of July. An unusually cold outbreak on July 12/13 produced snowfalls to low levels across the South Island and also brought heavy snow to the lower and central North Island. Flooding rains occurred across the eastern South Island on the 21st, and State of Emergency declarations were issued for Otago, including Dunedin and Oamaru, as well as for Timaru and Christchurch.

Jul 2017 Climate Anomaly Maps ℅ NIWA.gif

Some very preliminary July 2017 figures for the main centres:

Code: Select all

July 2017 Average Temps, Rainfall, Sunshine and departures from 1981-2010 normals ℅ NIWA

Site                     T-max °C      T-min °C      T-mean °C     Rain mm      Sun hrs

Auckland, Mangere       15.0  +0.5     8.0  +0.7    11.5  +0.6    190  138%    126   96%
Auckland Aero           14.6  +0.3     7.8  +0.3    11.2  +0.3    178  134%
Tauranga Aero           14.4  -0.1     6.3  +0.2    10.3   0.0    124   96%    n/a   n/a
Hamilton Aero           13.9  +0.1     4.2  +0.6     9.0  +0.3    160  124%
Wellington, Kelburn     11.5  +0.1     6.4  +0.1     8.9   0.0    230  168%     97   81%
Christchurch Aero       10.0  -0.9     1.0  -0.4     5.5  -0.3    159  246%     93   73%
Dunedin, Musselburgh     9.5  -0.5     2.6  -0.5     6.1  -0.4    157  274%    100   91%
Greymouth Aero          11.7  -0.4     4.4  +0.4     8.1   0.0    229  116%    128  119%

Lowest temps included -14.6C at Lake Tekapo (760m) and -13.7C at Mt Cook Aero (660m) on the 29th.

TonyT wrote:The Christchurch figures have been calculated incorrectly, if the mean max is -0.9 from normal and the mean min is -0.4 from normal then the mean must be -0.65 from normal, not -0.3 as stated.