Image / NiwaNew Zealand may be in for another major marine heatwave this summer – possibly as severe as two of the biggest we've ever recorded here. Remind me again, what's a marine heatwave? Niwa considers a marine heatwave as sea surface temperatures (SSTs) that stay in the warmest 10 per cent of historical observations for at least five days. According to the latest guidance, the signal for marine heatwave conditions for the months ahead was even stronger than the state of play last September. The marine heatwave of 2017-18, as observed in late November, 2017.

Source: New Zealand Herald September 18, 2022 23:59 UTC