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NZ this week: High pressure that has sprung a leak (+4 Maps)

High pressure looks set to dominate New Zealand this week but it comes with a catch – it will have some localised low pressure caught up in it too. It’s a basic yet complicated forecast with high pressure mainly controlling our weather this week yet at the same time an area of sinking air pressure is entwined, meaning we have a mainly calm week ahead with daily downpours.

Very generally speaking the North Island looks more exposed than the South Island does this week for areas of patchy showers or downpours, shifting the recent dry spell back to a more normal set up for this time of the year (ie, a mix of dry and wet weather). 

The further south you go the drier this week looks, which will be welcome news in water logged Southland. 

The high over New Zealand is a bit like a tyre with a leak in it, meaning it’s not fully inflated over all of the country which allows for more cloud and some wet weather to sneak in or develop.

Some of the afternoon downpours which develop this week (and coming weekend) will be heavy, especially inland where daytime heating may contribute to bigger downpours and even isolated thunderstorms again.

– 1pm rain and air pressure map for Wednesday shows high pressure in charge but locally low pressure sticking around the North Island / MetOcean



LM on 9/12/2018 9:31pm

Water logged Southland? Some inland parts might be wetter than normal due to the thunderstorms last week but it’s more ‘water logged’ in parts of the east!

WW Forecast Team on 9/12/2018 10:03pm

Southland is mostly wetter than average with farmers telling us repeatedly they have never had so much ponding or water in December. Many asking us lately when flooding on their property will disappear and in some cases lakes have replaced grass which was about to be cut for hay. If you’re a townie then chances are you haven’t had too much rain though! 


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