Reissue at 12:40pm Thursday - no changes. Periods of heavy rain with possible thunderstorms and/or localised downpours are expected to affect Auckland overnight tonight (Thursday) and Friday morning. Between 10pm tonight (Thursday) and 5am Friday, localised downpours of 25-40mm/h are possible in some parts of the Auckland region (including the islands of the Inner Hauraki Gulf). 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 valleys, and may also lead to slips. Driving conditions will also be hazardous with surface flooding and poor visibility in heavy rain. Further heavy rain or thunderstorms are possible on Friday, and this Severe Thunderstorm Watch may be extended.
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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