Some flooding also occurred in the Northland region on 27 January. January 2023 was declared the wettest month ever in central Auckland by NIWA, with the total of 539 millimetres (21.2 inches) surpassing the 420 mm (17 in) recorded in February 1869. 27 January was declared the wettest day in Auckland on record, with 258 mm (10.2 in) of rain at Auckland Airport exceeding the previous record of 161.8 mm (6.37 in). Some parts of the city had over 400 mm (16 in) of rain within a week. The peak 2-minute rainfall in Māngere was 4.2 mm (0.17 in). Metservice also reported that 299.5 mm (11.79 in) of rain fell at Albert Park in a span of 34 hours. The highest daily rainfall occurred in Māngere, with a total of 265 mm (10.4 in). By 10:00 pm on 27 January, other locations in Auckland had reported record daily rainfalls before the day was over the Museum of Transport and Technology (MOTAT) had had 238.4 mm (9.39 in), Albany had had 260.6 mm (10.26 in), and Māngere had had 242 mm (9.5 in). Īccording to NIWA, Auckland Airport received more than its average monthly rainfall for January (201 mm 7.9 in) within one day on 27 January. This atmospheric river was brought down into the New Zealand area by the remnant low left behind by Tropical Depression 06F, which moved south into the Tasman Sea. Timeline Īverage rainfall, rainfall anomaly, and observed rainfall from 24 January to 8 February 2023, NIWA Late January įrom 27 January, a tropical atmospheric river carrying a long band of rain and thunderstorms lay mostly stationary over the upper North Island, blocked by a large anticyclone to the southeast of the country which prevented it from moving south across New Zealand.
Significant flooding events had previously occurred in Auckland in August 2021 and March 2022. Tar seals and concrete surfaces on roads, carparks, and buildings also prevent rainwater from dispersing into the ground, causing water to pool up and surfaces to flood during heavy rain events. Īccording to Victoria University of Wellington climate scientist James Renwick and University of Auckland urban planning lecturer Timothy Welch, Auckland, along with many other areas in the country, experiences ageing stormwater infrastructure systems which are unable to cope with population growth and the impact of climate change. Before the events of 27 January, there was already sentiment brewing among some in the country that the summer of 2022–23 was the country's "worst summer ever". Heavy rain plagued the northern and eastern areas of the country through most of January, with flooding events shortly after New Year, and Cyclone Hale impacting the country on 10 and 11 January. In January 2023, Auckland and the upper North Island experienced relentless maritime heatwave conditions caused by the annual La Niña cycle and exacerbated by climate change.
Minister of Finance Grant Robertson stated at the time that the event was New Zealand's costliest non-earthquake event ever. Over the following days other areas of the upper North Island were impacted. The event is considered to be the worst floods in Auckland's modern history. NIWA reported that an entire summer's worth of rain fell within one day in what it described as a 1-in-200-year event. Flooding was widespread across the city, with West Auckland and North Shore being the worst affected areas. Severe flash flooding occurred across Auckland from around 5:00 pm on 27 January local time, after heavy rain in the afternoon. Map of the North Island, where the floods occurredĢ7 January 2023 ( ) – 2 February 2023 ( ) (7 days) īeginning on Friday, 27 January 2023, regions across the upper North Island of New Zealand experienced widespread catastrophic floods caused by heavy rainfall, with Auckland being the most significantly affected as the Auckland Anniversary holiday weekend began.
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