It's an autumn trifecta for weather-induced misery: strong and slowing moving low pressure, deep tropical moisture, and a blocking ridge of high pressure to the south. The strong and slow moving low pressure is the driving force behind all of the adverse weather. The deep tropical moisture is an atmospheric moisture source from the Indian Ocean, Coral Sea, and Pacific Islands, known as an atmospheric river. The weather is expected to slowly settle across most of New Zealand by the middle stages of next week. By late next week and into next weekend, high pressure may be the dominant weather player across the country, bringing plenty of dry weather and gradually warmer temperatures.

Source: New Zealand Herald March 08, 2017 07:49 UTC