Temperatures returning to normal for most
The unusually cold temperatures that have affected New Zealand over the past few days should return to normal for most
places this weekend. A stronger westerly flow developing over the country should mix in some slightly warmer air, and
also push cloud and a few showers into western areas and the far south. "It's not going to be warm, but it will be
warmer than what it has been!" said MetService Meteorologist Stephen Glassey.
Frosts have been reported right across New Zealand this week, including Northland and Auckland. South Island's Mackenzie
Country in particular has experienced bone-chilling temperatures. Pukaki Aerodrome near Twizel dropped to minus 19.8
degrees on Tuesday morning, and Omarama dipped to minus 21 degrees on Wednesday morning. Although these were records for
these places, they fell short of reaching the New Zealand record of minus 25.6C at Ranfurly in 1903.
The freezing temperatures in the Mackenzie Country were due to a combination of several factors. Firstly, a very cold
southerly flow died out over the South Island on Monday. This left behind clear skies, no wind and snow covered ground,
providing perfect conditions for temperatures to plummet. Proximity to the winter solstice, providing the longest nights
of the year, also helped. "Although the cold air might stay trapped in the Mackenzie Basin for a little while longer, it
shouldn't reach the same extremes as the past few nights due to the westerly flow developing over New Zealand," said
Glassey.
Looking ahead to the weekend, this westerly flow should bring fine weather for the Super 15 semi-final between the
Hurricanes and the Brumbies in Wellington on Saturday night. Kick off temperature is estimated to be around 10 degrees
with a northerly breeze. Fine weather is also forecast for the second semi-final between the Highlanders and Warratahs
in Sydney later that evening.
Keep up to date with the latest forecasts and any watches/warnings atmetservice.com or on mobile devices at m.metservice.com. You can also follow our updates on MetService TV, at MetService New Zealand on Facebook, @metservice on Twitter and at blog.metservice.com
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