Periods of heavy rain with thunderstorms and/or localised downpours are expected to affect Northland and Auckland tonight and Friday morning, where localised downpours of 25-40 mm/h are possible. The thunderstorm and downpour risk initially starts in Northland tonight, then spreads southwards to Auckland overnight. These downpours could occur with or without thunderstorms. 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.
Note: A Severe Thunderstorm Watch means conditions are favourable for severe thunderstorms in and close to the watch area. People in these areas should be on the lookout for threatening weather conditions and monitor for possible Severe Thunderstorm Warnings. For information on preparing for and keeping safe during a storm, see the Civil Defence Get Ready website
Periods of heavy rain, and amounts may approach warning criteria. Peak rates of 15 to 25 mm/h, but rates of 25 to 40 mm/h possible in localised downpours and thunderstorms. Chance of upgrading to a Warning: Low.
Action: Monitor for updates.
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