An unstable airmass affects the South Island this afternoon and evening. For the Canterbury High Country and foothills south of Arthur's Pass, Central Otago, the Queenstown Lakes District, far inland areas of Southland and inland Fiordland, there is a moderate risk of thunderstorms. There is also a moderate risk that some of these storms may become SEVERE until 10pm today, which could produce localised downpours of 25 to 40 mm/h. 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
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