Warkworth / Auckland Region

Severe Thunderstorm Watch

Period: 5hrs from 9pm Sun, 16 Jun - 2am Mon, 17 Jun

Area: Auckland, Great Barrier Island

Forecast: An unstable northwest airflow lies over the northern North Island. There is a moderate risk of thunderstorms about Auckland, including Great Barrier Island, from mid-evening until early tomorrow morning. Whether these thunderstorms occur or not, there is a chance of localised downpours of 25 to 40 mm per hour. Areas about and near the Hauraki Gulf are most likely to experience the downpours, but they may also occur elsewhere in Auckland. Rainfall of this intensity can cause surface and/or flash flooding, especially about low-lying areas such as streams, rivers or narrow valleys, and may also lead to slips. Driving conditions will also be hazardous with surface flooding and poor visibility in heavy rain.

Mangawhai / Northland Region

Severe Thunderstorm Watch

Period: 6hrs from 6pm - midnight Sun, 16 Jun

Area: Northland

Forecast: An unstable northwest airflow lies over the northern North Island. There is a moderate risk of thunderstorms for Northland this evening, and whether these thunderstorms occur or not, there is a chance of localised downpours of 25 to 40 mm per hour. Conditions should start easing in the north after 10pm. Rainfall of this intensity can cause surface and/or flash flooding, especially about low-lying areas such as streams, rivers or narrow valleys, and may also lead to slips. Driving conditions will also be hazardous with surface flooding and poor visibility in heavy rain.