Another hot one

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Another hot one

9/02/2009 2:37am

> From the WeatherWatch archives

3:30pm update

Conditions remain hot in the north and east of both islands however a cool southerly change is moving up the country.

A very weak warm front is moving down Northland but isn’t bringing much in the way of rain – as per our latest Auckland forecast.

North Island hot spots

Hamilton 27

Paeroa 28

Rotorua 29

Gisborne 32

Mahia 34

Hastings 34

Palmerston North 26

South Island hot spots

Blenheim 33

Christchurch 32

Wanaka 27

Invercargill is still just 12 degrees due to a southerly.

Comments

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Guest on 9/02/2009 5:40am

We have dropped another 2.8 degrees in the last 18 minutes thanks to the drizzle . Now we need to loose the humidity. Its so muggy. Temp 24.2c. Also thanks Derek.

Guest on 9/02/2009 5:22am

We’ve finially got the rain if you call it that may be constant drizzles a better term and the temps coming down. 27c at 6.20pm. Still muggy though.

Derek on 9/02/2009 4:06am

In Whangarei the light rain has stopped and the sun came out for awhile making it feel as though you were walking into a wall of high humidity and heat, would’nt mind a bit of that cool front from down south coming this way.
Presently 27 Deg and 71% humidity.Oh for a cool breeze.

Derek on 9/02/2009 4:01am

To Temps of Te Aroha, Seems to me you have got it right, keep the info coming.

Guest on 9/02/2009 2:50am

Today we hit 30c at 12.30pm and we are now at 32c at 2.23pm. At least its cooler than yesterday but today we have a nice breeze and the temp is still warm so we could have reached yesterdays temp if we had no breeze to speak of like yesterday. For those who don’t believe how some of us are getting our temps. We are a small country town along the Kaimai Ranges. We have two gages, one is electronic and the other is the old style one. They are both out of direct sunlight. They both are position as required to get a true reading. Both are on the south side attached to wood. (South east and South west). They are both reading around the same temps. The difference is about 0.2 degrees out. So with yesterdays temps up at 34c on one the other was at 33.9c. If you have any suggestions on how we can better our readings your help would be great.

weather-nut on 9/02/2009 11:11pm

Hi Te Aroha reader. Glad someone finally asked. Other nearby official readings on Sunday (including Paeroa and Matamata) all showed max temperatures of about 30C-32C and yesterday, about 30C-31C. So, although feasible, it does tend to suggest that your readings might possibly be a little on the high side. There may however also be some local typographical features that might help to enhance temperatures in your area. When you say “south side attached to wood”, presumably you mean of a building? Even near the shady side of a building, on hot days unshielded thermometers normally tend to read about 1.5C higher than the general ambient air-temperature.

As mentioned before, official temperature readings are normally taken over large, open, flat, well-ventilated, trimmed-grassed areas, and at least 9m away from any heat producing sources such as buildings, trees, concrete, tar-seal, etc. These, and most other objects, all have the ability to absorb and then reradiate heat (including the shady side of a building). In an urban environment, open park areas, playing fields, school grounds, and aerodromes are often used to meet this criteria. Being well out in the open, instruments are normally shielded from the sun (and rain) in a white, well-ventilated, louvered wooden-box (known as a Stevenson Screen) or more recently in a modern form of equivalent radiation-shield (sometimes with fan assisted aspiration). Instrument height is normally about 1.5m from the ground.

Also, in a typical urban situation, the combined heat absorbed and radiated from buildings, roads etc, produces it’s own micro-climate (known as ‘the urban heat-island effect’). In the confinements of the average backyard, this effect may be compounded. So when siting most home weather-station instruments, it’s usually a case of having to make a few compromises. Therefore, comparing the average backyard reading with local official readings is probably a little unrealistic. If however you live in a more exposed rural situation, then it may be easier to meet more of the above criteria.

Heated Up Weather Watcher on 9/02/2009 2:48am

Over 34 degrees at around 3pm in Christchurch, now it’s nearly 4pm and it’s dropped to 22 degrees. The southerly change must be on its way!

Derek on 9/02/2009 2:17am

We have light rain in Whangarei now, 25 Deg and 78% Humidity, quite uncomfortable doing anything, energy level low. Also a warm night coming up with a predicted low of 21 deg, fan working overtime.

Rain is welcome though and will do a lot of good. Assuming we will get more than what is falling right now.

Mel on 9/02/2009 1:54am

Is the rain still coming to Auckland Phil??

WW Forecast Team on 9/02/2009 2:31am

I think our forecast is the most accurate for today… the radar shows very little on the way this afternoon however tomorrow’s now possibly looking wetter.

Here’s out latest forecast: http://www.weatherwatch.co.nz/content/auckland

Our next update will be around 6pm this evening. This one gives us the most up to date weather data for the next 12 hours…so will give us a much better idea as to what’s happening tonight and tomorrow morning rainwise.

Cheers!

Phil

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