Nothing to do with climate change, just the opposite. This summer's La Nina has reduced the normal easterly influence at the equator resulting in COOLER global temperatures. That same change in circulation patterns has moved warmer waters south west to the Tasman Sea and provided a track for tropical cyclones to approach NZ. Under the climate change scenario we should see more El Ninos with warmer equatorial waters and cooler sea surface temperatures in the Tasman moving the tropical cyclone tracks to the east of NZ.
Bookmarks