Northland and Auckland have been warned that heavy thunderstorms and heavy rains are expected.
Starting this afternoon, up to 40 milliliters of rain can fall in the western part of Northland and northwestern Auckland, according to MetService.
Especially in the lowlands, surface and flash floods can occur and slippage can occur.
The warning is valid until 11:00 pm tonight.
Bad weather is the first day of autumn and the rest of the week is expected to be cold for many people across the country.
NIWA meteorologist Chris Brandolino said that when the seasons officially change, the weather changes rapidly.
He said the warm and humid weather this week wouldn’t last until the weekend, as the cold weather is heading north.
Autumn Flash: Heavy Thunderstorm Warning in Auckland, Northland
SourceAutumn Flash: Heavy Thunderstorm Warning in Auckland, Northland