How does Cyclone Cook compare with last week's big storm? Experts explain.

Five findings from a new independent stocktake of the state of our lakes and rivers.

Broadcaster Alison Ballance discusses her new book on New Zealand's great white sharks.

Floodwaters or sanitation concerns, or both, are keeping Edgecumbe residents away.

Enjoy the fine weather while it lasts as another storm is set to move over the country.

A breach in a stopbank of the Rangitaiki River was closed at 11pm last night.

Niwa meteorologist Ben Noll explains what you need to know about Debbie.

A school is being evacuated and flooding is hitting lots of areas in in the North Island.

It is expected to pour with rain today.

The power-packed storm meteorologists have dubbed the "Tasman Tempest" dumped more rain on Auckland than typically falls for the whole of March.

The skies are beginning to clear after last night's storm, but the respite may be short-lived, with thunderstorms and more heavy rain forecast for later today.

COMMENT: The Environment Minister's promise to make 90 per cent of rivers swimmable by 2040 is a cynical sleight of hand, writes Gen Toop from Greenpeace.

Endurance athletes looking to improve their times might consider swishing with a mouth rinse that contains a little sugar during their next performance.

Our forests and other land areas may be sucking up to 60 per cent more carbon dioxide out of the atmosphere than previously thought and we can likely thank our native trees for much of it.

Two months into the job, new Science and Innovation Minister Paul Goldsmith talks to science reporter Jamie Morton about the state of the sector.

Regional climate variability caused an unusual period in which some of NZ's glaciers grew bigger, while glaciers worldwide were shrinking, a new study shows.

Preparing New Zealand's water stores for a warmer climate is a major focus of new research projects just awarded more than $2 million.

It's a question summer-deprived Wellingtonians couldn't be blamed for asking: Why is Australia sweltering in a heat wave while their own city hasn't broken 25C all season?

The dramatic, kilometres-deep canyons that lie hidden beneath our waves need protection from human pollution and damage, scientists say.

The "safe version" of a Great White shark has washed up on Wellington's shore, leaving experts puzzled about what may have happened to it.

While the eastern region swelters in one of the most rain-deprived Januaries in more than a century, some western areas have been drenched.

Is summer really getting later? We look at long-term Niwa figures.

Kiwis "must be vigilant" about swimming in our rivers, a freshwater scientist says, with data often showing high levels of E. coli in waterways.

Climate change scientists have projected continued global greenhouse gas emissions would heat Northland heat up more than other regions

Northland farmers are facing drier than normal conditions.

Science reporter Jamie Morton talks to Auckland Uni conservation ecologist Dr James Russell about the challenge to sweep islands clear of pest predators.

The West Coast has held on to its dubious record as the wettest place in New Zealand, albeit in the Southern Alps.

Last year was New Zealand's hottest on record since 1909. Where did we really feel the heat?

Dr Brett Mullan of the National Institute of Water and Atmosphere (NIWA) explains our holiday season weather and warming world.

Last year was the hottest ever record, according to a European climate agency and a US-based climate centre.