A high-pressure system to the east ensured the weather system was slow moving and would continue to hang around through to Saturday.
"It's a blocking high and weather systems can't go through it," Bell said.
The weather system, while slow-moving, was beginning to run out of energy, he said.
The South Island and southern parts of the North Island could expect some areas of showers with fine breaks moving toward the weekend.
Some areas were pounded with heavy rain yesterday. Happy Sams on the Anatoki River in Golden Bay near Nelson received a whopping 333mm of rain in 24 hours.
It hit a maximum hourly rate of 32mm in one hour, while Mt Taranaki was doused with 250mm.
Heavy rain warnings were in place in Auckland until 6am today, and Northland and Taranaki until midday.
The Coromandel Peninsula also had a warning with up to 130mm expected.
Today's forecast
Whangarei: Rain. NE. High 24C Low 20C
Auckland: Rain. NE. High 25C Low 20C
Hamilton: Rain. NE. High 25C Low 17C
Napier: Cloudy. NE breezes. High 28C Low 20C
Wellington: Showers. N. High 24C Low 18C
Christchurch: Showers. S to E. High 25C Low 14C
Dunedin: Showers. NE. High 22C Low 16C