A deepening sub-tropical low is behaving as predicted bringing a mix of light and heavy rain across northern New Zealand Tuesday – and more wind and rain is on the way.

WeatherWatch.co.nz says the low is deepening and will cross northern New Zealand overnight and into Wednesday morning.

It will then move out into the Tasman sea, moving westwards away from Auckland, before curving back northwards and weakening before moving back into northern New Zealand again on Thursday in a much weaker state.

“Basically as this low crosses Northland and Auckland overnight tonight a new low will form near East Cape, causing low number one to get caught up in low number two’s spin – in other words, these two northern lows are working a little bit like ying and yang” says head weather analyst Philip Duncan.

The complicated nature, and small size of the low, means rain fall may be intense for some, but only drizzly for others – as we’ve seen over the past 24 hours.

Generally speaking the worst of the weather is across Tuesday and Wednesday with conditions easing on Thursday and dry weather returning for most places on Friday and the weekend.

Mr Duncan says for the most part this system shouldn’t cause too many headaches but that a number of weather warnings are in force which people should be aware of.

– WeatherWatch.co.nz