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Thunderstorm watch continues for Southern areas

File photo.

A combination of afternoon heating and wind convergences are expected to develop thunderstorms over the southeast of Fiordland, Southland, Clutha and inland parts of eastern Otago.

"There is a moderate risk of these thunderstorms becoming severe in the afternoon and early evening, producing localised downpours of 25-40mm, and hail of 10 to 20mm diameter," says MetService.

Thunderstorm activity should ease tonight. 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.

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