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A cold sou'wester swept through Dunedin yesterday, dropping the temperature from 14degC to 6degC.
''It is a sign of things to come,'' MetService meteorologist John Law said.
A special weather advisory was issued yesterday warning the cold southwest flow would bring another wintry blast to Otago and Southland this week.
It was not expected to bring snow to levels as low as last week's in Dunedin but temperatures would only get as high as about 7degC or 8degC, he said.
The city was forecast to get sleet, hail and snow to about 400m but Clutha was expected to bear the brunt with snow down to 100m to 200m. Strong winds would increase the wind-chill factor.
Inland, the sleet and hail could turn to ice, so drivers needed to be careful, especially in rural areas in the mornings, he said.
''Although no large snow accumulations are expected, winter will make its presence felt.''