The MetService has downscaled it's snow predictions for the South Island's alpine passes

Up to 12 centimetres was expected to land on Canterbury's Porter's Pass but that failed to materialise.

That's been dropped to one centimetre with snow warnings lifted for Arthur's, Haast, Lindis passes, and the Crown Range and Milford roads.

Lewis Pass - and in the North Island- the Desert Road - can now expect a few snow flurries with little accumulating.

Waka Kotahi Journeys manager Tresca Forrester says the main concern is ice, as cold conditions continue over the next 24 hours.