Severe storms possible this afternoon in Auckland, Waikato and Bay of Plenty

MetService has issued a severe thunderstorm watch for the Auckland, Waikato and Bay of Plenty areas for this afternoon.

"Warm and moist conditions at the surface and sea level convergence are likely to trigger frequent showers," MetService wrote.

"Some of these may be slow moving and thundery, and could bring localised downpours to some areas.

"Rainfall intensities could reach 25 to 40mm per hour.

"The showers are expected to ease gradually this evening."

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MetService warned that downpours of that volume could cause flash flooding, especially in streams and low-lying areas, and people were advised to remain up to date on weather conditions.