"To me it looks like the hail was quite small so they were able to group together quite well, which is why it has that appearance of snow on the ground."
Ferris said the hail formed when there was a lot of circulation in the atmosphere and the very cold liquid formed in the updrafts that were associated with the thunderstorms.
The eastern areas of Auckland's coast as far north as Mangawhai had borne the brunt of the thunderstorms this afternoon.