Global · Climate
Severe Weather
SevereIncreasingly frequent and severe floods, droughts, storms and heat driven by a warming climate.
- Likelihood
- Certain — already happening
- Impact
- Severe and compounding
- Horizon
- Now, worsening through the century
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Background
What this actually is
The physical mechanism is simple: warmer air holds about 7% more moisture per degree of warming, so rainfall events get more intense. Warmer oceans provide more energy to storms and extend the range of tropical systems poleward.
The systemic risk is compound events — drought and heat together, or successive floods before recovery from the last one. Insurance and public finance are built on the assumption that disasters are independent and infrequent.
The second-order effects — crop failure, displacement, water conflict, insurance retreat — arrive before the direct physical effects become intolerable.
Aotearoa
What it means for New Zealand
Cyclone Gabrielle in 2023 was the costliest weather event in NZ history and the second-costliest insurance event after the Canterbury earthquakes. NIWA projects more ex-tropical cyclones reaching NZ, more drought in the east, and sea-level rise that puts significant coastal infrastructure and thousands of homes at risk. Managed retreat is now an active policy debate rather than a hypothetical.
Watch for
Early warning signs
- MetService red warnings becoming routine in your region
- Insurance premium increases or withdrawal in your area
- Council coastal hazard or flood overlay changes to your property
- Consecutive record-warm sea surface temperatures around NZ
Action
How to prepare
- 01
Check your property against your regional council hazard maps — this is free and most people never do it
- 02
Know your evacuation route and have a grab bag ready
- 03
Photograph your possessions and store the record off-site for insurance
- 04
Assume three days minimum without outside help after a major event
Go deeper
Where to find more information
In an emergency
New Zealand's official channels
- Get Ready — household preparedness
- Civil Defence / NEMA
- GeoNet — quakes, volcanoes, tsunami
- MetService severe weather warnings
In a life-threatening emergency call 111. RNZ National is New Zealand's designated lifeline broadcaster — keep a battery radio.
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