On 1 July 2025, NIWA merged with GNS Science to become Earth Sciences New Zealand.

Cirrus / mares tails

Wispy, white and made of ice crystals cirrus clouds are usually found at altitudes of 5000m or more in New Zealand. They are often seen ahead of a front, and may indicate deteriorating weather conditions. Streaks of cirrus are sometimes called mare's tails. Photo taken by Alan Blacklock.