Coastal hazards

Decisions about how we adapt to sea-level rise need to be based on information about our exposure to coastal flooding, both now and in the future after a period of rising sea levels.

Storm-tide red alerts are the highest high tide (also known as king tides) dates that Emergency Managers and Coastal Hazard Managers should write in their diaries and keep an eye on adverse weather (low barometric pressure, onshore winds), river levels and sea conditions (waves and swell). This page shows the 2023 dates of the highest high-tide "red alert" dates, and the lowest high-tide dates.

Storm-tide red-alert days 2024

This system combines daily sea-level data from NIWA, regional councils, port companies, Antarctica NZ, Bureau of Meteorology and territorial authorities.

Coastal risk exposure for New Zealand, adaptation guidance for local government and relevant summaries of previous court cases and Building Act 2004 determinations.

The New Zealand Palaeotsunami Database (Database) brings together all known information about tsunamis that occurred prior to written records.