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RNZ News
3 days ago
- Climate
- RNZ News
MetService says location of new Tasman rain radar still to be decided
The Lower Waimea River in the aftermath of Tasman-Nelson floods, New Zealand. Photo: Tim Cuff / POOL MetService says a new rain radar will get around the mountainous terrain and known blackspots in Nelson-Tasman, but its exact location is yet to be decided. The government said work would begin immediately to procure a new radar for the top of the region - which has endured repeated floods caused by heavy rain - with the aim to have it up and running by the start of 2027 . A new radar would cost MetService up to $5 million, with operating costs of around $800,000 a year. MetService general manager of observing systems Kevin Alder told Morning Report the Wellington radar that was being used for the top of the South Island - although geographically close - was imperfect. "Its coverage over Nelson is blocked in the lower elevations by the terrain of the Richmond Ranges which are around 1500 metres, 5000 feet high. "And so, we really can't see into Tasman Bay and the surrounding areas." He said a radar on the ground in the area would solve that problem, and MetService would work with the district councils to secure "the best possible site" for it. While the initial weather warning would be the same, it added in the detail once the weather system hit, he said. "It gives much better information to emergency managers as the event unfolds and particularly the timing of when an event is going to end. "We can track the rainfall, the severe weather in real time with the radar, and really help with those immediate decisions during the event." Alder said the complex technology and associated infrastructure accounted for the multi-million dollar price tag. "We normally have to put them on a tower and all the supporting infrastructure for it, with communication and data links - it all adds up." He said although weather systems could be monitored from space, ground-based radar were the best detection method for an area. "You'd have to have a lot of satellites in space to cover New Zealand." The announcement at the weekend came after years of campaigning, with the region considered a blank spot in the national radar coverage. Associate Transport Minister James Meager said the community had been asking for a radar, and its installation would not only give locals "peace of mind", but would help them better prepare for future disasters. Emergency Management and Recovery Minister Mark Mitchell said Nelson-Tasman had been in five states of emergency since 2011, and a new weather radar would help emergency managers better monitor rainfall and flooding risk - "reducing the risk of loss of life and property". Sign up for Ngā Pitopito Kōrero , a daily newsletter curated by our editors and delivered straight to your inbox every weekday.
RNZ News
22-06-2025
- Climate
- RNZ News
Auckland's 'vulnerable' rain radar at end of life but must survive another year
The remote radar site is located on Mount Tamahunga near Warkworth and is only accessible via helicopter. Photo: Supplied by MetService Auckland's ageing rain radar needs to survive another year before it can be replaced with a new model. The radar on Mount Tamahunga was commissioned in 1989 and regular upgrades have kept it running well beyond its typical 20-year lifespan. MetService's general manager of observing systems Kevin Alder told Nine to Noon the radar was a critical piece of infrastructure. "Its job is to provide information on current weather conditions, so where precipitation is actually falling, and it does this by scanning every seven and a half minutes," he explained. "It has a range of 300 kilometres so it can see weather coming in off the Tasman Sea or in from the north-east coming into Auckland so it's critical for forecasting services and also for Auckland Council and how they manage severe weather events." MetService was in the process of replacing its weather radars up and down the country, starting with Wellington and Canterbury. "We've been funded through the Ministry of Transport to replace it in this current four-year period, and in that agreement in 2023 we were also funded to replace to the Canterbury and Wellington radars; those two were prioritised because their structures had seismic risks," Alder said. Alder was confident that MetService had the right equipment and spare parts to keep the old radar running until it could be replaced around the end of 2026 or start of 2027. "The current radar is 36 years old, it's done its time, but we have the ability to keep it running until the replacement technology is installed," he said. "We've been maintaining it throughout its life, it had quite a significant mid-life upgrade in around 2007 or 2008. We've done subsequent upgrades to its power supplies and communications infrastructure, most recently in the last three years." The new radar would be worth the wait, he said, promising new technology to give more accurate weather warnings. "We have a technology called dual polarisation which allows us to see much more clearly the shape and size of the raindrops, we can tell whether the precipitation is frozen, whether it's hail, and how quickly [the rain is] falling, and from that we get much better estimates of rainfall intensity." Sign up for Ngā Pitopito Kōrero , a daily newsletter curated by our editors and delivered straight to your inbox every weekday.
RNZ News
22-06-2025
- Climate
- RNZ News
Auckland's rain radar 'vulnerable' at end of life
Auckland's rain radar has reached its end of life and is vulnerable to significant outages in the event of a component failure. The coverage of country's largest city and biggest international airport relies on outdated technology, which limits forecasting and warning capabilities in the region. This was the advice given to Associate Minister of Transport James Meager - who has oversight of the Meteorological Service of New Zealand Limited (MetService) contract for forecasting. The Auckland rain radar, commissioned in 1989, is the oldest in the network and while periodic upgrades have allowed it to extend its useful life well beyond the typical 20-year horizon, it is now in need of urgent replacement. To discuss are MetService's General Manager of Observing Systems Kevin Alder and MetService's Chief Meteorologist Chris Noble. The remote rain radar is located on Mount Tamahunga near Warkworth and is only accessible via helicopter. Photo: Supplied by MetService
