More than 1000 lightning strikes have been recorded across New Zealand today, and more are expected, as a band of thunderstorms moves in from the Tasman Sea.
MetService meteorologist Daniel Corbett said a severe thunderstorm watch would likely remain in place for Auckland, Northland, Great Barrier Island and the Coromandel Peninsula at least until tomorrow.
He said a brief reprieve in the stormy weather in Auckland this afternoon would be short lived.
"I wouldn't be out there with my picnic basket,'' Mr Corbett said.
"It's heavy rain in places. There's a risk of hail, frequent lightning - it's pretty awful over the next few hours.''