A cold west to southwesterly airflow lies over the country on Wednesday.

West to southwesterly winds freshen over much of the North Island on Wednesday, expect showers for all western areas, heavy at times from midday. Snow lowers to 400m overnight about the Central Plateau.

Showers for Southland and the West Coast of the South Island, heavy at times with a risk of hail. Conditions may be dry at first for Otago then showers with a risk of hail moving in by midday, showers move into Canterbury mid afternoon. Just the risk of a shower about Marlborough by evening. Snow to 400m about Southland and Otago, possibly lowering to 200m for a time overnight then easing. Snow lowers in the ranges of Canterbury down to 400m by evening.

By Weather Analyst Aaron Wilkinson – WeatherWatch.co.nz