Snowfall warnings have been issued across the country as a cold snap moves in.

Lindis Pass and Milford Road will experience snow showers tonight and tomorrow.

Up to three centimetres of snow is expected about the Homer Tunnel and 10 to 15cm will fall to the south of Lake Gunn.

Showers on the Desert Road may turn to snow tomorrow evening, and up to two cm could accumulate at elevations from 800m above sea level.

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Lewis Pass and Porters Pass are both expected to have snow showers tomorrow, with some snow accumulating above 600m.