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Tuesday’s Weather Video – Largest low on earth moving away

The largest storm on earth is moving away from the country, bringing an end to the icy and rainy conditions we’ve seen at the start of the week.

Wednesday is looking like improving, with a high pressure system starting to impact the country’s weather, particularly in the evening.

Thursday is looking even better – check out the details with Philip Duncan, below!


John on 27/05/2015 1:19am

Just wondering what would have happened if the eye of that storm had struck across the lower half of the south island? Would it have had similar effects as a tropical storm? Curious as it was said to be larger than the storm that did the damage to New Orleans…

WW Forecast Team on 27/05/2015 1:37am

Hi John, good question!  The main difference between a deep low in the Southern Ocean and a deep low in the tropics is the centre.  Tropical lows are usually very tightly wrapped up – and the damaging portion is severe around that centre.  With these lows the air pressure can be similar but the worst of the winds tend to be spread over a much greater area.  If it had made a direct hit it would’ve meant a lot more wind – damaging gales south of the lower North Island – and perhaps more importantly – the southerly blast would’ve extended up into the sub-tropics, meaning snow would’ve fallen lower, further north.  Luckily most of these storms weaken if they move too far north towards us – but every one of them is worth monitoring closely as they can be quite moody!  So because the winds are spread out further than Katrina, we wouldn’t see the same storm surge or destructive winds. Nor would we see as much rain, as tropical lows create torrential downoours, but these Southern Ocean lows having drier air – so we get more showers.

Hope that helps!

John on 27/05/2015 6:22am

Thanks for your reply Phil. I wasn’t aware of those differences. Makes me pleased to be a Southerner with the cold keeping some nasty weather phenomena at bay 😀

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