Tropical Cyclone Tam triggers weather alerts across New Zealand’s North Island (2025)

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Post navigation Strong and shallow M6.7 earthquake hits near the coast of South Island, New Zealand; tsunami advisory issued Anomalies of the recent SSW event begin downward propagation, potentially bringing a cold start to August Major wildfire in Christchurch’s Port Hills, state of emergency declared, New Zealand Two destructive tornadoes hit New Zealand Orange Warning for heavy rain in Hawke’s Bay, grave concerns for region still recovering from Cyclone Gabrielle, New Zealand National state of emergency declared as Cyclone Gabrielle causes widespread destruction across New Zealand’s North Island Cyclone Gabrielle – Extreme rain and winds impact New Zealand, unprecedented rainfall totals expected in some areas Bright fireball observed over New Zealand’s North Island Strong and shallow M6.7 earthquake hits near the coast of South Island, New Zealand; tsunami advisory issued Bright fireball over New Zealand produces sonic boom Increased activity, Aviation Color Code raised to Orange at White Island volcano, New Zealand Very bright fireball over New Zealand produces house-shaking sonic booms Earthquake swarm in Taupo Volcanic Zone, New Zealand Powerful tornado rips through Mangawhai, New Zealand Nearly 40 million brace for severe weather from Great Lakes to Southern Plains through Easter weekend Shallow M5.2 earthquake near San Diego triggers numerous aftershocks, Southern California Large Saharan dust plume impacts southern and eastern Europe Severe sandstorms move across northern China, breaking wind records at 499 stations and prompting rare public advisories Severe dust storms hit Delhi, leaving 2 dead and 5 injured, India Severe thunderstorms leave 80 dead across Uttar Pradesh and Bihar, India Two tropical cyclones threaten northern Australia with heavy rain Commenting rules and guidelines Leave a reply Latest articles Critical to Extremely Critical Fire Weather expected in much of New Mexico and parts of Texas, Colorado, and eastern Arizona Nearly 40 million brace for severe weather from Great Lakes to Southern Plains through Easter weekend Two dead after landslide buries a house in Dagua, Colombia CME impacts Earth sparking widespread aurora, G3 – Strong storm Watch in effect for April 16 Shallow M6.6 earthquake hits Southeast Indian Ridge From the same category Nearly 40 million brace for severe weather from Great Lakes to Southern Plains through Easter weekend Shallow M5.2 earthquake near San Diego triggers numerous aftershocks, Southern California Large Saharan dust plume impacts southern and eastern Europe Severe sandstorms move across northern China, breaking wind records at 499 stations and prompting rare public advisories Most read Supermassive black hole Ansky awakens with record-breaking X-ray flares Shallow M6.6 earthquake hits Southeast Indian Ridge CME impacts Earth sparking widespread aurora, G3 – Strong storm Watch in effect for April 16 Nearly 40 million brace for severe weather from Great Lakes to Southern Plains through Easter weekend Two dead after landslide buries a house in Dagua, Colombia Critical to Extremely Critical Fire Weather expected in much of New Mexico and parts of Texas, Colorado, and eastern Arizona Hailstorm destroys wheat crops in Russia’s key agricultural Stavropol region Floods claim 16 lives in Namibia and displace thousands Severe sandstorms move across northern China, breaking wind records at 499 stations and prompting rare public advisories Severe thunderstorms leave 80 dead across Uttar Pradesh and Bihar, India Over 144 000 livestock lost in devastating Queensland floods, Australia Two tropical cyclones threaten northern Australia with heavy rain Deadly floods and landslides strike Java and Kalimantan provinces, Indonesia Major eruption at Lewotobi Laki-laki volcano ejects ash to 16.2 km (53 000 feet) a.s.l., Indonesia Violent M7.7 earthquake hits Sagaing, Myanmar, leaving over 4 400 fatalities, 5 400 injured and many missing Strong M7.1 earthquake hits Tonga, potential tsunami threat Shallow M6.6 earthquake hits central Mid-Atlantic Ridge Very strong M6.9 earthquake hits Reykjanes Ridge Six new species discovered beneath Antarctic seafloor after iceberg A-84 break-off Entire settlements submerged as historic floods batter Queensland, Australia

Featured articles | Tropical cyclones

ByRishav Kothari

Tropical Cyclone Tam, named by the Fiji Meteorological Service on April 15, 2025, is moving southeast and will bring severe weather to New Zealand’s Upper North Island beginning April 16. The center of the storm is expected to remain west of Cape Reinga, but heavy rain, strong winds, and dangerous coastal conditions are forecast to impact North Island in the days ahead.

Tropical Cyclone Tam triggers weather alerts across New Zealand’s North Island (1)

Satellite image of Tropical Cyclone Tam at 18:20 UTC on April 15, 2025. Credit: JMA/Himawari-9, Zoom Earth, The Watchers

Tropical Cyclone Tam formed between New Caledonia and New Zealand on April 15 as the fourth named storm of the 2024–25 South Pacific cyclone season, following Pita, Rae, and Seru.

Tam is currently located about 400 km (250 miles) east of New Caledonia and is moving southeast toward New Zealand’s North Island. Although it is not forecast to make landfall and is expected to be reclassified to a subtropical depression on Thursday, its outer bands will bring severe weather conditions to the Upper North Island from April 16 to 17.

As of 13:13 UTC on April 15, Tam was classified as a Category 1 tropical cyclone with a minimum central pressure of 988 hPa, moving southeast at 37 km/h (23 mph). It had a 10-minute maximum sustained wind speed of 84 km/h (52 mph), forecast to decrease to 55 km/h (34 mph) by April 16 as the system weakens to a tropical low.

Tropical Cyclone Tam triggers weather alerts across New Zealand’s North Island (2)
Tropical Cyclone Tam triggers weather alerts across New Zealand’s North Island (3)

Weather warnings have been issued for Northland, Auckland, and Aotea / Great Barrier Island and they are expected to be upgraded as the system approaches. Large waves are expected along the east coast from Northland to Gisborne, with swells reaching 6 m (20 feet) on April 17.

According to NZ Transport Agency Waka Kotahi, the Auckland Harbour Bridge may be closed or have speed limits reduced at short notice. Motorists are advised to exercise caution. Flooding is possible, along with damage to trees, power lines, and unsecured structures.

Auckland Transport advised that public transport could be disrupted due to increased risks on the roads. An Orange Heavy Rain Warning will come into effect for Northland at 03:00 local time (LT) on April 17. An Orange Strong Wind Warning will begin in Northland, Auckland, and Great Barrier Island at 15:00 LT on April 17.

The Coromandel Peninsula, Bay of Plenty west of Kawerau, Rotorua, Kaimāī Range, Waikato, Waitomo, and Buller are also expected to experience impacts from the storm.

Tropical Cyclone Tam triggers weather alerts across New Zealand’s North Island (4)

Heavy Rain Watches have been issued from Auckland south to the Bay of Plenty, in effect from 03:00 local time on April 17 to 12:00 on April 18. Strong Wind Watches are in place from Coromandel to Taumarunui, valid from 00:00 on April 16 to 06:00 on April 17.

Authorities have stated that the Orange Warnings are likely to be upgraded to Red Warnings.

Residents are advised to prepare their homes for the storm and to place garbage bins out on collection day rather than the night before to reduce the risk of them being blown away and causing damage.

Reference:

1 Gale Warning 011 – Fiji Meteorological Service – April 15, 2025

2 Weather: Forecasters upgrade severe storm heading towards New Zealand to tropical cyclone – The New Zealand Herald – April 15, 2025

Rishav Kothari

Rishav is a skilled researcher specializing in extreme and severe weather reporting. He combines exceptional research capabilities with scientific precision to deliver clear, data-driven articles. Known for uncovering critical information, Rishav ensures his work is accurate, insightful, and impactful. His passion for both science and literature fuels his dedication to producing high-quality news articles. You can reach him at rishav(at)watchers(.)news.

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Tropical Cyclone Tam triggers weather alerts across New Zealand’s North Island (8)

Tropical Cyclone Tam triggers weather alerts across New Zealand’s North Island (2025)
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