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Warm weather across much of the country this weekend could be a taste of what summer will be like.  The Radio Network’s Head Weather Analyst says La Nina weather patterns are forming and basically that means we’ll get opposite weather conditions to last year.  “Last year we were in a strong El Nino weather pattern that brought dry conditions with a lot of westerly winds.  This Spring and Summer we’re likely to have more easterlies which will bringing more humid, warm weather to the nation”.  Duncan says while wintry snow storms are always possible right up until November, the chances of them will be much lower this year.
There is a downside though.  La Nina weather patterns remove blocking high pressure systems from the Tasman, shifting them to east of the country.  “This basically opens the door to tropical and sub-tropical lows forming, then often they are slow moving over New Zealand because of these highs to the east.  Northern New Zealand was dominated by several rain bearing lows during winter that formed in this area”.
More warm weather is expected over the North Island this week, with cold nights in the South Island easing in the next couple of days.  “A low in the Taman will slowly organise itself this week and will move over the nation around Thursday bringing rain and a slight dip in temperatures – although nothing too significant”.   Duncan says the low isn’t expected to be very intense.



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