General December Weather

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darcyplumb
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Re: General December Weather

Unread post by darcyplumb »

Some impressive towers to my south. Rapidly developing.
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Thunder081
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Re: General December Weather

Unread post by Thunder081 »

darcyplumb wrote:Some impressive towers to my south. Rapidly developing.
I think these are them, looking north from Timaru. I wonder if the north otago storm will keep going and get this farImage

Looking south:



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Wellington southerly front timelapse: www.youtube.com/watch?v=MBl3hsuIg2Q
darcyplumb
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Re: General December Weather

Unread post by darcyplumb »

Yes I believe they’re the same ones I’m looking at. They’ve been building for some time now but no precipitation yet.
Thunder081 wrote: Thu 30/12/2021 15:51
darcyplumb wrote:Some impressive towers to my south. Rapidly developing.
I think these are them, looking north from Timaru. I wonder if the north otago storm will keep going and get this farImage

Looking south:



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Image
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Re: General December Weather

Unread post by NZ Thunderstorm Soc »

Huge tower going up over Raukapuka at the moment with a change from the NE to southerly.
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Last edited by NZ Thunderstorm Soc on Thu 30/12/2021 17:51, edited 1 time in total.
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Re: General December Weather

Unread post by Chris W »

Just watched the southeasterly change go up through mid-Canterbury on radar (so much for my comments about northward movement) and that has triggered some cells inland west of Chch.

Can't see squat in terms of low/mid-level cloud from home due to the hills, so probably going to take a drive through the tunnel soonish and see what's happening.
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Re: General December Weather

Unread post by darcyplumb »

That storm north of Oamaru looks intense. No warning on it at the moment.
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Re: General December Weather

Unread post by trickytiger »

darcyplumb wrote: Thu 30/12/2021 16:22 That storm north of Oamaru looks intense. No warning on it at the moment.
Went all the way to oamaru. Didn't really come to much just heavy rain, no thunder, lightning or hail
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Re: General December Weather

Unread post by darcyplumb »

I’m getting the impression that the ingredients just aren’t quite right for today. Someone with a bit more knowledge than me can elaborate I’m sure.
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Re: General December Weather

Unread post by Razor »

Looks a big fat bust from here
Christchurch Rocks
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Re: General December Weather

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Storm over Waimate is now severe warned for large hail.
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Re: General December Weather

Unread post by Chris W »

The cold front (and upper cold air) that is triggering most of the storms is only up to Timaru, anything ahead of that is just convergence is my reading of it. Remember the risk is mainly Ashburton south (and includes the evening) so I wouldn't expect much around Chch. That said, the cell going north looks large and reasonably potent with what looked to be hail on its back end (looking from Tunnel Road). Tony might have a report on that one soon?
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Re: General December Weather

Unread post by Orion »

A few spots of rain here at the moment: the clouds around are more interesting than one might glean from the rain-radar.
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Re: General December Weather

Unread post by TonyT »

Chris W wrote: Thu 30/12/2021 17:27 The cold front (and upper cold air) that is triggering most of the storms is only up to Timaru, anything ahead of that is just convergence is my reading of it. Remember the risk is mainly Ashburton south (and includes the evening) so I wouldn't expect much around Chch. That said, the cell going north looks large and reasonably potent with what looked to be hail on its back end (looking from Tunnel Road). Tony might have a report on that one soon?
Seems slow moving and a high base. Doesn't look like much is falling from it...
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Re: General December Weather

Unread post by dogmelon »

Its a modest shower in avonhead. Check out how showers are boiling up alonv the foothills on the radar. Fascinating stuff.
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Re: General December Weather

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What southerly? Stunning night farther westImage

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Re: General December Weather

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Southerly wind just arrived after a day of NW winds
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Re: General December Weather

Unread post by dogmelon »

There is heavy rain in Avonhead. It boiled up in-situ.
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Re: General December Weather

Unread post by NZ Thunderstorm Soc »

After a promising morning with a NE wind and ground heating, a sad day here with no thunderstorms forming but the clouds did look impressive this afternoon especially after the southerly wind change around 3:30pm. Some photos below.
Today' s maximum was 24C and we had 0.4mm of drizzle this evening.
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Re: General December Weather

Unread post by spwill »

A cooler finish to December here after all the earlier humid warmth. We could do with some rain/showers here but the Summer ridge is in full control, another dry week next week.
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Re: General December Weather

Unread post by mikestormchaser »

Storms that fired yesterday were pretty much in the vicinity of where we thought it would happen. Despite the odd small cell further north. The thing lacking yesterday was the cold air. -20 wasnt an overly cold air mass at 500mb
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Re: General December Weather

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mikestormchaser wrote: Fri 31/12/2021 14:26 Storms that fired yesterday were pretty much in the vicinity of where we thought it would happen. Despite the odd small cell further north. The thing lacking yesterday was the cold air. -20 wasnt an overly cold air mass at 500mb
Did you go and chase? You would of had to go way past Timaru for any action. Haven't heard of any reports of hail damage from the 2 warnings that MS issued yesterday afternoon so it couldn't of been all that severe. :-k
The clouds that developed at the wind change looked good here but that was that. :(
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Re: General December Weather

Unread post by NZ Thunderstorm Soc »

After the clearance of low cloud and drizzle , it was a fine day but with lots of layered mid to upper level cloud. Quite mild with light N to NE winds but becoming calm later in the day. Mild day with it getting up to 20.6C. Mild calm evening to welcome in the New Year.
Done the rainfall total for the year which was 986.1mm over 156 days. More details on this years weather later from here.
...anyway, here is a photo I took this evening of the sunset to farewell 2021.
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Re: General December Weather

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December 2021 averaged 20.5C on my station, a full 2.5C warmer than Dec 2020. Have not been below 10.0C since Nov 19th.

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David
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Re: General December Weather

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Howick - December 2021

Summary
An extremely warm month with average rainfall, almost all of it falling in 3 days around the middle of the month. The nights in particular were very warm.

Stats
Mean temp = 20.6C (+2.1C)
Mean daily high = 24.4C (+1.3C)
Mean daily low = 17.5C (+2.9C)
Highest temp = 27.2C (on days 9 and 25)
Lowest temp = 12.1C (on day 20)
Total rainfall= 84.4mm (-1.6mm, or 98% of average)
YTD rainfall = 1084mm (-128mm, or 89% of average)
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Nev
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Re: General December Weather

Unread post by Nev »

An exceptionally warm December overall rounded off what is likely to be NZ's warmest year on record. Many record warm December mean temps recorded in northern parts of the country, including Auckland, Tauranga and Hamilton. Rainfall a bit of a mixed bag, but generally wetter than normal in central and eastern areas and drier in northern and southern areas.

Dec 2021 Climate Anomaly Maps ℅ NIWA.png

Preliminary December 2021 figures for the main centres:

Code: Select all

Dec 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       24.1  +2.5    17.9  +3.1    21.0  +2.8      -    -     213  108%
Auckland Aero           24.2  +2.4    17.6  +2.7    20.9  +2.6    106  123%
Tauranga Aero           24.5  +2.3    17.2  +3.3    20.9  +2.9    116  123%    n/a   n/a
Hamilton Aero           24.3  +2.1    14.3  +2.7    19.3  +2.4     78   75%
Hamilton, Ruakura       24.6  +2.6    14.8  +2.8    19.7  +2.7     73   74%    202   97%
Wellington, Kelburn     19.7  +1.1    13.8  +1.5    16.8  +1.4    232  279%    185   83%
Christchurch Aero       20.4  -0.7    12.0  +1.5    16.2  +0.4    130  277%    167   76%
Dunedin, Musselburgh    18.7  +1.4    11.7  +1.3    15.2  +1.4     62   78%    205  122%
Greymouth Aero          20.1  +1.9    12.9  +1.7    16.5  +1.8    270  107%    156   93%
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