South Canterbury residents should watch for unstable weather tomorrow afternoon.
MetService has issued a severe thunderstorm warning for Wednesday afternoon and evening across South Canterbury.
Scattered heavy showers and thunderstorms are expected to develop in the afternoon, affecting mid Canterbury to Otago and spreading north later in the day.
Thunderstorms in South Canterbury and Eastern Otago are expected to be particularly severe, producing localised downpours, large damaging hail, squally winds and possibly a small tornado.
The change in weather is brought on by a combination of cooling temperatures in the upper atmosphere, onshore breezes and a southerly wind change.
For more information on the storm outlook, check http://www.metservice.com/national/warnings/severe-thunderstorm-outlook.
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