MetService has issued several weather warnings and watches across New Zealand, with the chance of some being upgraded to the most severe category from Wednesday to Friday (16-18 April).

Cyclone Tam is expected to bring sustained heavy rainfall and severe easterly gales to many areas of the North Island and upper South Island.

• Northland is currently under an orange heavy rainfall warning, with a low chance the warning will upgrade to red. An orange wind warning will come into force for the region later on Wednesday (16 April) afternoon with a moderate chance of being upgraded to a red warning.
• Auckland and Great Barrier Island are under heavy rainfall watches, with a moderate chance of being upgraded to a warning. On Wednesday (16 April) night, an orange wind warning will be in place, with a low chance of being upgraded to a red warning.
• Thunderstorms are possible on Thursday (17 April) in Northland and northern Auckland. These may locally intensify the effects of the ongoing heavy rainfall and strong winds in the area. Gusts near the Auckland Harbour Bridge may approach 100 km/h today and could exceed that on Thursday (17 April).
• A heavy rainfall watch for Coromandel Peninsula and parts of Bay of Plenty was upgraded to an orange warning. Parts of Gisborne have been issued an orange rain warning from Thursday (17 April) night until Friday (18 April). There is a minimal chance of it being upgraded.
• Coromandel Peninsula, Waikato and Waitomo have been issued a strong wind watch from midnight Wednesday (16 April), with high chances of being upgraded to a warning. Taumarunui, Taihape and parts of Taranaki have been issued strong wind watches from Thursday (17 April) morning, with a moderate chance of those being upgraded to warnings.
• Parts of Tasman has been issued an orange rainfall warning from Thursday (17 April) night until midnight Friday (18 April). MetService stated there is a low chance of this warning being upgraded.
• Buller has a strong wind watch issued for early Thursday (17 April) morning until Friday (18 April), with a moderate chance of being upgraded to a warning.
• Auckland Transport stated there would be a higher safety risk out on the roads, and some public transport services may also be affected, especially ferries.
• Civil Defence Northland stated that local emergency services, councils, contractors, and partner agencies, including health and welfare agencies, have all been working on their preparations and are ready to respond if necessary.