"In the 12 hours from 11pm on Monday, there have been a few stations across Hawke's Bay that has seen around 20mm of rain – Wairoa being one of them," he said.
MetService warned that the heavy rain in the Wairoa area may cause streams and rivers to rise rapidly.
A Wairoa District Council spokeswoman said the severe weather may cause hazardous driving conditions, surface flood and possible slips in the district.
According to WeatherWatch, the gale force winds which blasted the Cook Strait on Tuesday morning were due to shift over to the eastern side of the North Island on Tuesday night.
"Gusts will be between 80 and 120km/h in the windiest areas on land and may go even higher in Cook Strait for a time," a WeatherWatch spokeswoman said.