Climate & Weather

NIWA has crunched the data on this week’s heatwave and come up with the following record breakers

Areas deemed hotspots have expanded significantly during the past week in the North Island, while in the South Island the previous hotspot encompassing Nelson and nearby portions of Tasman has continued to strengthen during the past week.

23 January 2019. By Voyage Leader Dr Richard O'Driscoll.

The water in the New Zealand region is significantly warmer than it was 30 years ago, and all indications are the warming trend will continue, says a NIWA scientist.

The previous hotspot in the Far North dissipated around the Aupouri Peninsula in the past week, but has spread south into northern Whangarei and Kaipara districts. The current hotspot in Tasman could strengthen in the next week, while central Canterbury may see a new hotspot form in the coming week.

The previous hotspot in the Far North has expanded in size during the past week, now encompassing much of the eastern Far North and the Aupouri Peninsula. A hotspot remains in place across Nelson and nearby portions of Tasman, but no other South Island hotspots are in effect at this time.

To give insights to sea surface temperatures, NIWA scientists have combined predictions from 8 climate models from institutes around the world.

A weekly update describing soil moisture across the country to help assess whether severely to extremely dry conditions are occurring or imminent. Regions experiencing these soil moisture deficits are deemed “hotspots”. Persistent hotspot regions have the potential to develop into drought.

Across the North Island, soil moisture levels either decreased slightly or remained the same during the past week. Across the South Island, soil moisture remained near normal or above normal in the central and eastern part of the island during the past week while areas in the west have near normal or below normal soil moisture.

The driest soils across the North Island compared to normal for this time of the year are found in an area stretching from coastal Manawatu-Whanganui northeast to Taupo. The driest soils across the South Island compared to normal for this time of the year are found in far southern Westland District. A small hotspot has emerged in Nelson in the past week.

A new hotspot emerged in the Rangitikei District in Manawatu-Wanganui during the past week. This is the only current hotspot in the North Island. There are currently no hotspots in the South Island.