An icy blast may cause delays for motorists in Canterbury with snow from an overnight flurry expected to settle on the alpine passes.
A heavy dumping of up to 30 centimetres of snow was forecast to blanket the top of Porters Pass, State Highway 73, between late Sunday evening and Monday afternoon.
Lewis and Arthur’s passes were each forecast to receive between 4cm and 8cm during the same period and scattered powder was expected to settle on Lindis Pass. Road snow warnings were in place.
Meanwhile, up to 50 millimetres of rain was forecast for Christchurch and Banks Peninsula in the 24 hours to Monday night.
MetService meteorologist April Clark said there would be “significant snow over 600 metres” in Canterbury and the region’s ski fields could expect a “good dumping”.
Mt Hutt and Porters ski area could both receive another 20cm from the fast-moving front.
Mt Hutt and Mt Dobson were closed on Sunday due to severe black ice on the access road and blizzard conditions.
Canterbury’s high-country, the peaks of Banks Peninsula and the top of north Marlborough may get a light sprinkling, but a snow day was unlikely for those in Christchurch, Clark said.
Fresh southwesterly winds and rain were forecast to dampen Christchurch on Monday after a warm weekend, she said.
The chilly front, which would bring single-digit temperatures, would pelt the city from Sunday night and ease to the “odd shower” by Tuesday,
“We’re overdue for a bit of rain, but for people in Christchurch it might come as a bit of a shock after a week of pretty warm weather.”
The city council has placed temporary pumps in Southshore and Flockton Basin in preparation.
Up to 50 millimetres of rain was forecast for Christchurch and Banks Peninsula in the 24 hours to Monday night.
Council land drainage team operations leader Tim Joyce said flooding was possible in low-lying areas, but Monday’s high tide was expected to be lower than it was during last month’s floods.