General March Weather

spwill · Unread post by **spwill** » Sun 26/03/2017 11:48

A pleasant day so far, sunny spells , current 24C, dp 18C.
Longer range keeps the rather humid/chance of rain or showers going through the week.

midgrove · Unread post by **midgrove** » Sun 26/03/2017 13:34

GFS model has strongest surface winds of 50 knots between low and Antarctic coast with a very large area of gales north of the low. At that latitude pressure gradients produce much less wind than further north.

Captain Salty · Unread post by **Captain Salty** » Sun 26/03/2017 15:55

why is that?

midgrove · Unread post by **midgrove** » Sun 26/03/2017 16:56

The wind is the result of 2 forces, pressure gradient force where wind flows from high to low pressure, and Coriolis force which is the spin caused by earths rotation. Coriolis force is increases from high to low latitudes (the earth is spinning faster at the equator). Since these 2 forces must balance, the same pressure gradient at 30 South will give twice the wind speed than at 50 South. Sorry if this is a bit fuzzy, I'm relying on meteorological theory i learned nearly 30 years ago!

jamie · Unread post by **jamie** » Sun 26/03/2017 21:03

midgrove wrote:The wind is the result of 2 forces, pressure gradient force where wind flows from high to low pressure, and Coriolis force which is the spin caused by earths rotation. Coriolis force is increases from high to low latitudes (the earth is spinning faster at the equator). Since these 2 forces must balance, the same pressure gradient at 30 South will give twice the wind speed than at 50 South. Sorry if this is a bit fuzzy, I'm relying on meteorological theory i learned nearly 30 years ago!

Oh wow I didn't know that until now. Thanks for the info here.

treetop · Unread post by **treetop** » Sun 26/03/2017 22:59

Interesting . I suppose you can add wind gusts to the 50 k. The Northern side would have higher winds [against earths rotation] and with it wind changes and squlls..

cbm · Unread post by **cbm** » Mon 27/03/2017 09:55

A few Northern locations must be threatening their March rainfall records

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spwill · Unread post by **spwill** » Mon 27/03/2017 11:03

cbm wrote:A few Northern locations must be threatening their March rainfall records

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Yes. I see Whangaparaoa has had 318.6 mm. Some intense downpours there.

cbm · Unread post by **cbm** » Wed 29/03/2017 17:41

http://www.stuff.co.nz/auckland/9096582 ... -on-record

Thought that July 1998 would be meantioned soon as the only month comparable to this. Hard to forget having to drive though quite deep water on SH1 at Meremere several times, due to the spillway operating.

Richard · Unread post by **Richard** » Thu 30/03/2017 18:18

Lovely autumn day with 25,7deg

Richard · Unread post by **Richard** » Thu 30/03/2017 19:15

Dan is at it again with reporting a ridiculous 30deg at Hanmer Springs on the TVNZ weather

Bradley · Unread post by **Bradley** » Thu 30/03/2017 20:45

EC being very uncharacteristically bullish in its assertion of a significant rain event for Canterbury next Wednesday with widespread falls of 50-70mm, 3 runs in a row now...

NZ Thunderstorm Soc · Thu 30/03/2017 20:54

Richard wrote:Dan is at it again with reporting a ridiculous 30deg at Hanmer Springs on the TVNZ weather

Up there this WE doing Morris Dancing,.
hope it's not that hot.
Do you want to come and join us Richard?

Richard · Unread post by **Richard** » Fri 31/03/2017 07:01

NZ Thunderstorm Soc wrote:
Richard wrote:Dan is at it again with reporting a ridiculous 30deg at Hanmer Springs on the TVNZ weather
Up there this WE doing Morris Dancing,.
hope it's not that hot.
Do you want to come and join us Richard?

Yer, i reckon i could, what sorta frock would i need to wear

melja · Unread post by **melja** » Fri 31/03/2017 16:10

Was up in hanmer yesterday truck driving and it was extremely hot.

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Dean. · Unread post by **Dean.** » Fri 31/03/2017 17:55

Warm humid day here,currently 24 dewpoint 18

David · Unread post by **David** » Sat 01/04/2017 08:54

March 2017 summary for Howick

Average temp = 18.8
Average max = 23.0
Average min = 15.2
Highest temp = 25.3 (28th)
Lowest temp = 10.1 (16th)
Total rainfall = 324mm

RWood · Unread post by **RWood** » Sat 01/04/2017 14:00

A drab miserable month here, the cloudiest since 1979 and the "daylight saving" months Sept-March have never had so little sunshine.

Nev · Unread post by **Nev** » Sat 01/04/2017 15:46

March 2016 was a very wet month for the upper half of the North Island, with many places recording over 300mm, and some up to around 600mm. It was also a mostly warm month, particularly in the second half, apart from Wellington and the east and south of the South Island. However, the lower half of the South Island was also quite sunny, while it was fairly cloudy for most of the rest of the country…

Mar 2017 Climate Anomaly Maps ℅ NIWA.gif

Some very preliminary March 2017 figures for the main centres:

Code: Select all

Mar 2016 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       22.9  +0.5    15.8  +1.2    19.3  +0.8    269  315%    172   90%
Auckland Aero           23.0  +0.4    16.5  +1.6    19.7  +0.9    261  347%
Tauranga Aero           23.4  +0.9    15.6  +1.8    19.5  +1.3    275  283%    n/a   n/a
Hamilton Aero           23.2  +0.3    13.2  +2.2    18.2  +1.3    216  256%
Hamilton, Ruakura       23.2  +0.5    13.9  +2.5    18.5  +1.4    238  298%    163   89%
Wellington, Kelburn     18.6  -0.5    12.9  +0.3    15.7  -0.1    130  153%    143   70%
Christchurch Aero       19.3  -1.0    10.2  +0.6    14.7  -0.2     77  169%    n/a   n/a
Dunedin, Musselburgh    17.0  -0.3     9.8  -0.4    13.4  -0.3     46   72%    184  127%
Greymouth Aero          18.8  -0.1    12.0  +1.0    15.4  +0.5    158   89%    176  110%

Note the Sth Akld rainfall figures are a little lower than other parts of Akld, e.g. Whangaparaoa recorded 354mm. A few other notable rainfalls include 591mm at Golden Valley, 412 at Whitianga (EWS), 378mm at Rotorua Aero and 359 at Kerikeri Aero.

NZstorm · Unread post by **NZstorm** » Sat 01/04/2017 17:51

It did not rain often in the month but when it did it poured.

Rainfall trace for Mangatangi, east Auckland. 475mm!

Nev · Unread post by **Nev** » Sat 01/04/2017 18:02

Forgot to mention that the PWS in Hunua recorded 608mm and another in Clevedon recorded 533mm. Meanwhile the Coromandel's Pinnacles was just 1mm shy of 1,000mm for the month…

spwill · Unread post by **spwill** » Sat 01/04/2017 20:00

The month had a mild to warm feel here. It was a better weather month than the rainfall numbers might suggest.

jamie · Unread post by **jamie** » Sun 02/04/2017 05:28

Mangatangi is north Waikato isn't it?

David · Unread post by **David** » Sun 02/04/2017 09:47

jamie wrote:Mangatangi is north Waikato isn't it?

Yes. But it's easy to think otherwise because Google maps has an incorrect Auckland/Waikato boundary line.

NZ Thunderstorm Soc · Sun 02/04/2017 17:32

Richard wrote:
NZ Thunderstorm Soc wrote:
Up there this WE doing Morris Dancing,.
hope it's not that hot.
Do you want to come and join us Richard?
Yer, i reckon i could, what sorta frock would i need to wear

We have heaps of frocks to choose from if you want to join us

Anyway back home from there. it was quite warm up there this WE. I heard from people there that Hanmer has been the top NZ temperature last couple of days.Mind you it would be cooler now that the southerly has come through.

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