Meteorologists are monitoring a volatile weather pattern in the South Pacific as a tropical cyclone headed to New Zealand could bring significant rainfall and wind to the North Island within the coming week.
The potential threat comes as two separate systems currently churn in the region: Cyclone Maila in the Solomon Sea and Cyclone Vaianu, which is tracking between Vanuatu and Fiji. Whereas the systems are currently distant, forecasters warn that the remnants of the more powerful system could bring hazardous conditions to New Zealand’s upper North Island by the weekend.
MetService forecaster Louis Fernando noted that Cyclone Vaianu, currently a Category 2 storm, is rapidly gaining both speed and power. “It is looking like it will intensify to a Category 3 either later today or into tomorrow,” Fernando said. He added that current weather models indicate the remnants of the cyclone could impact parts of the North Island as the week progresses.
The looming threat of the cyclone is compounded by an immediate weather system already triggering alerts across the upper North Island. MetService has issued an orange heavy rain warning for the Northland region, effective from 10 p.m. Monday through 4 p.m. Tuesday, alongside a strong wind watch beginning at 3 a.m. Tuesday.
Immediate risks for Northland and Auckland
The most acute concerns are currently centered on Northland, where rainfall totals are expected to reach between 90 and 120 mm, particularly in the northern and eastern sectors of the region. This forecast is particularly concerning for communities still recovering from severe flooding and heavy rains that struck at the end of March.
Beyond Northland, heavy rain watches remain in place for Auckland, the Coromandel, and the Bay of Plenty. Local authorities are urging residents in these areas to prepare for potential disruptions and maintain a high level of vigilance.
️
New Severe Weather Watches and Warnings have been issued.To read the full Watches and Warnings go to the MetService websitehttps://t.co/HZ2TSD5rV7 @AucklandCDEM @CivilDefenceWKT @BOPCivilDefence pic.twitter.com/IJThhXL8fn
— MetService NZ (@MetService) April 5, 2026
The ‘sandwich’ effect: Why the weather is stalling
The current instability is the result of a complex interaction between two competing atmospheric systems. MetService meteorologist Alec Holden described the country as being “sandwiched” between these forces, which is prolonging the wet weather across the eastern seaboard.
To the northwest, a broad area of low pressure is attempting to move across New Zealand and head south. However, its progress is being significantly hindered by a ridge of high pressure acting as a atmospheric block. This stagnation is drawing a substantial feed of subtropical moisture over the country.
“Later today, and then through tomorrow and Wednesday, this broad low pressure system… Is going to be trucking its way over the country,” Holden said. He noted that this specific movement is the driver behind the current warnings for the upper half of the North Island.
Current Weather Alerts Summary
| Region | Warning Level | Primary Threat | Expected Impact |
|---|---|---|---|
| Northland | Orange Warning | Heavy Rain/Wind | 90–120 mm rain; strong winds |
| Auckland | Watch | Heavy Rain | Increased shower activity |
| Coromandel | Watch | Heavy Rain | Increased shower activity |
| Bay of Plenty | Watch | Heavy Rain | Increased shower activity |
Uncertainty in the forecast
Despite the clarity regarding the general threat, pinpointing the exact areas that will be hardest hit remains a challenge for meteorologists. Holden admitted that the predictive models have been “quite jumpy,” providing varying solutions regarding the location of the heaviest rainfall from one data run to the next.
This uncertainty is common with tropical remnants, which can shift trajectory or intensify unexpectedly as they interact with local pressure systems. The primary advice for residents is to avoid relying on a single forecast and instead monitor updates in real-time.
Those living in areas under active watches and warnings are encouraged to stay informed via the MetService warnings page and follow all guidance issued by Civil Defence.
The meteorological community will continue to track Cyclone Vaianu as it moves through the South Pacific. The next critical window for updated projections will occur as the system approaches the weekend, at which point the likelihood of the remnants reaching the North Island will be more clearly defined.
Do you live in an affected region? Share your local updates or concerns in the comments below.
Worth a look
