General September Weather

[Dean.]

13mm here mostly this morning

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[03Stormchaser]

Snow flurries in Oxford earlier today, about 230m. Much lower I think than MS had forcasted

[NZ Thunderstorm Soc]

Two rain showers just after midday and about a hour ago. Banks Peninsula rainshadow effect over Chch? Radar's been looking far more active over the plains and foothills; reports of snow in Oxford and at upper edge of plains near Methven.

Yes, Ben, snow low down on Mt. Peel and the 4 Peaks. Photos later.

[NZ Thunderstorm Soc]

A cold day here with lots of grey skies and the occasional light rain/drizzle with a light south to easterly.
I couldn't understand why the forecasts were so persistent with thunderstorms and hail, when, with today's weather conditions, thunderstorm activity was obviously not possible?
Were there any thunderstorms around?
Skies were clear here this evening, now it is coming onto rain. It this was 1pm this afternoon, maybe it would be a different story ?
Today's maximum was just 8.6C. 2.4mm of precipitation for today.

[mikestormchaser]

I couldn't understand why the forecasts were so persistent with thunderstorms and hail, when, with today's weather conditions, thunderstorm activity was obviously not possible?
Were there any thunderstorms around?

Hi John, never looked thundery today, timing was off and there was a cap where the atmosphere was to stable. Hence the cloud cover early morning.

Canterbury thunderstorm season doesn't normally get firing until later in October

[NZ Thunderstorm Soc]

Canterbury thunderstorm season doesn't normally get firing until later in October

I agree. I do tend that MS and other forecasters do tend to over-forecast thunderstorms in their forecasts, with terms like 'thundery showers' and 'heavy falls'. when you only get a few spits or drizzle
Yes. I, traditionally have used the Canterbury Thunderstorm Season to be from 1201am Oct the first to 1159pm of 31st of March.
but there can be thunderstorm activity before and after these dates.

[Razor]

Were there any thunderstorms around?

Work colleague was in Kaikoura, and they had thunder yesterday

[03Stormchaser]

Incase anyone doesn't check the off topic board, a Canterbury Meet has been organised for this weekend.

viewtopic.php?f=10&t=6316

[NZ Thunderstorm Soc]

Today looks more thundery than yesterday as there are lots of fluffy but weak Cu's going up. Shame there is no 'oomph'

[Chris Raine]

We had distant thunderstorms just after midnight Sunday morning on the SW centred in Te Wae Wae Bay

[Chris Raine]

We have had 140mm so far this month .Wet and a few days to go

[NZ Thunderstorm Soc]

Some rain overnight but clearing away this morning but with lots of unstable Cu cloud around mostly weak humulus, however looking more 'thundery' as compared to yesterday's useless weather/forecasting? Cloud clearing away later this afternoon.
Today's maximum was 13C in sunny conditions this afternoon, with a cool NE.

[David]

Not many cold mornings here this month, 5.1C today being the lowest of the whole month

[spwill]

There is Tasman Sea low pressure modelled for next week, would mean a warmer week next week.

I see the thunderstorm season kicks off over eastern Australia this week.

[NZ Thunderstorm Soc]

After a frosty start, a nearly total blue dome day except for some cloud along the foothill.
17C for today. Light NE.

[Razor]

Looks like Dunedin just copped a decent storm, bit more vigourous that was forecast. MS have done a bit of "nowcasting" to cover it

[NZ Thunderstorm Soc]

Re the above, does look abit stormy down there. Nothing on the Blitz?
Might move north but doubt it, as it looked like a west to east flow.
Anyway, today was a pleasant day after a light air frost, with warm westerlies blowing bringing the max temperature up to 22.2C here.
Clouded this evening with a light SE.

[NZ Thunderstorm Soc]

A bit of drizzle overnight but clearing away from morning to be a fine day with NE winds to end off the month.
Today's maximum was 16.3C.

[Cyclone Tracy]

September 2021 stats locally –

Mean daily temp = 13.3c ( -0.2c 2018/20 average)
Rainfall = 132.4mm (+29mm 2001/2020 average)
Prevailing wind SW
1 thunder day. (same as ave 1.0)
Humidity 78.6% (+1.6% average)

YTD
Daily temp 15.98c , -0.15c average (2018/2020)
Rainfall 674mm , -235mm average (2001/2020)

[Awhituobs]

my (auto created) report
https://www.weather-display.com/windy/g ... 92021.html

[David]

Howick - September 2021

Summary
Dry first half and wet second half, resulting in the wettest month of the year to date. Temperatures near average.

Stats
Mean temp = 12.8C (+0.1C)
Mean daily high = 17.1C (+0.1C)
Mean daily low = 9.1C (+0.1C)
Highest temp = 19.7C (on day 25)
Lowest temp = 5.1C (on day 28)
Total rainfall= 136mm (+15mm, or 112% of average)
YTD rainfall = 821mm (-161mm, or 84% of average)

[Awhituobs]

that nice northerly rain events has meant Aucklands water storage is now at 85% (compared to average of 90%)
https://www.watercare.co.nz/Water-and-w ... RZEALw_wcB
plus other things like restrictions still on water use and more water being used from the Waikato have all helped
that is good news , I bet there are people sighing a sigh of relief
and with La Nina, the rest of spring /summer should in theory not see any major drought periods overall hopefully (there will always be dry periods)

[Nev]

Temps fairly close to normal overall for September 2021. It was also a mostly wet month, apart from Canterbury and North Taranaki/King Country, although generally fairly sunny overall, except for Northland and Stewart Island.

Sep 2021 Climate Anomaly Maps ℅ NIWA.png

Preliminary September 2021 figures for the main centres:

Code: Select all

Sep 2021 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       16.7  +0.4     9.7  +0.1    13.2  +0.2    124  121%    167  111%
Auckland Aero           16.9  +0.5     9.7   0.0    13.3  +0.3    112  124%
Tauranga Aero           16.7  +0.1     8.7  +0.4    12.7  +0.3    110  130%    n/a   n/a
Hamilton Aero           15.9  -0.4     6.1  -0.1    11.0  -0.3    178  176%
Hamilton, Ruakura       16.4   0.0     6.3  -0.4    11.4  -0.1    148  161%    146  100%
Wellington, Kelburn     13.5  -0.2     8.0  +0.1    10.8   0.0    127  129%    173  106%
Christchurch Aero       15.6  +0.8     3.1  -0.8     9.3  -0.1     39   96%    231  136%
Dunedin, Musselburgh    14.7  +1.5     5.6  -0.3    10.1  +0.6     46   96%    212  157%
Greymouth Aero          14.1   0.0     6.2  -0.4    10.1  -0.2    254  122%    140  106%

[spwill]

Auckland had a warmer June, the average June max at Mangere was 16.9C,min 10C, Motat 17.2C,9.9C.

[Awhituobs]

October looks to have warmer northerly quarter flows to start off with for the next 10 days at least
running out of time for it to be the 'coldest year in decades' that some people thought?