Stunned Devonport residents converged near a police cordon to see what was going on.
"We heard the wind coming through first. We heard this really loud whistling sound and then it came towards us but then veered off a bit,'' resident Paul Dalebroux said.
It pushed trampolines over and caused damage to numerous houses, he said.
"It wasn't very big so it wasn't that scary,'' he said.
Significant thunderstorms are currently forming over Waikato, WeatherWatch said. They are forecast to be much more severe than the ones exprienced in Auckland this afternoon.
See a photo gallery of the damage here:
Image 1 of 31: Damage in Devonport. Photo / Brett Phibbs