This chaotic-looking animation shows vorticity (a fancy nerd term for spin 🤓) in the upper atmosphere. These loops of high vorticity often correspond to low pressure at the earth's surface. This shows us that over the next 7-10 days NZ is likely to see slow-moving areas of low pressure periodically moving through our region with moderate to heavy rainfall, thunderstorms, and elevated humidity levels. 🌧️ ~Seth | NIWA Weather