.....An unusual atmospheric phenomenon is amassing in the stratosphere above Antarctica, called a Sudden Stratospheric Warming.
— NIWA Weather (@NiwaWeather) 22. August 2019
There have only been 2️⃣ such events on record & number 3️⃣ is possible next week!
It may contribute to unsettled, chilly weather across NZ in Sep-Oct ❄️ pic.twitter.com/LnZxMjVtUT