Severe thunderstorms, hail and the chance of a small tornado are forecast to hit the West Coast later on Wednesday.
MetService has issued a severe thunderstorm watch for Westland, with morning thunderstorms expected to die out before returning late afternoon or evening.
Between 5pm and 11pm a few of the thunderstorms may be severe, with localised downpours of up to 40mm per hour, hail, and possibly a small localised tornado.
If a tornado does occur, it may cause localised damage to buildings and vegetation.
Further thunderstorms are also likely to affect Westland on Thursday.