What’s going on with the weather? asks RNZ. Temperatures in parts of the country crashed by 15C to 20C in a matter of hours this week. But the mid-spring polar snap is soon expected to rebound back to warmer temperatures in a matter of days. This chilly turn, which has brought snow and ice from the deep south to the plains of central Taranaki, can be explained by a complex chain of events that originated not in Antarctica, but thousands of kilometres away in the Indian Ocean. Basically, the polar jet stream has taken “a very loopy pathway, all the way toward the South Pole, and then directly up into New Zealand,” says meteorologist Ben Noll.