A powerful slow moving Tasman low has produced a classic Marangai that has unleashed torrential rain on the upper North Island between 15th and 19th July. Converging moisture rich east to north east winds provided the ideal recipe for the subtropical deluge on Northland and parts of the Coromandel peninsular, with the Marangai peaking on the 17th July around Whangarei.
Widespread rainfall totals between 150 to 300mm were experienced across Northland with some areas around Whangarei above 400mm. Meanwhile parts of the Coromandel ranges went beyond 600mm, with the Pinnacles scoring 602mm across the same period. This event has caused significant damage to roads across Northland that will most likely takes years to rebuild according to local Northland council officials.
A BP in Whangarei swallowed by flood water on 17th July
MetService synoptic charge on 15th July
Extreme rainfall totals in parts of Northland and the Coromandel Range between 15th to 18th July.
MetService radar over Whangarei on 17th July at 9pm