Tropical moisture sets its sights on the North Island later this week 💧 Why? Learn about the Madden-Julian Oscillation (MJO), our climate driver this week. The MJO, a pulse of tropical rain and storms, is more active north of Australia during La Niña events because of warmer than average ocean temperatures. It can spark plumes of tropical moisture that extend down to Aotearoa from time to time, such as on Thursday-Friday this week. >Ben | NIWA Weather