The polar air moves into the deep south today and over the next 24-48 hours, it should work its way north over the country.
Worst affected areas seem to be the south and west of the mainland with snow lowering to near sea level in some places in Otago and Southland.
Eastern parts of Otago and Canterbury maybe a little sheltered (apart from the regional peninsulas) as the winds could be more westsouthwest but the cold will be felt by almost everybody.
Again the west of the South Island should be most protected from the southerly and Nelson too.
The pattern continues from the last 4 weeks with some sunny and mild days followed by wintry outbreaks.
The precipitation from this system in exposed areas could be somewhat higher than what we have seen from previous southerly changes over the last month.
Make the most of the mildish air in central and nothern regions today, as it maybe a few days before temperatures are restored to relatively comfortable levels!