A very narrow but intense area of weather lies just off the western coastline of Northland, Auckland and Waikato as of late Saturday morning and is very slowly tracking eastwards towards land. It will cross over the upper North Island over Saturday PM and then across Sunday. There are currently (as of near 11am) thunderstorms just west of the North Island coupled with some intense rain.
However the heaviest downpours and thunderstorms are mostly confined to an area no wider than just 50km west to east across. This is not an overly major widespread outbreak, rather it’s a narrow but very active slow moving front.
Outside of this narrow but active area of weather there are clouds and more normal isolated showers, some perhaps a little heavy.
The sometimes brisk nor’east flow is also helping bring sunny spells to the upper North Island ahead of this very narrow but active front – but the front is moving into this air flow so eventually the downpours will cross places like Auckland – the front may also break up or change intensity as it crosses Northland and Auckland later today. Saturday may not be as wet as some thought it might be but the risk for heavy downpours increases as Saturday wears on.
– WeatherWatch.co.nz (an official IBM Business Partner)