Fairfax Media Network

Weather News

Tasman low set to send big waves to the NSW coast this week

Craig McIntosh, Saturday October 28, 2017 - 13:15 EDT

An easterly trough low looks to deepen over the Tasman Sea this coming week, which is good news for big wave chasers along the NSW coast.

As a trough moves offshore on Monday, a defined low pressure system will form and deepen moving into Tuesday. Models indicate the system has the necessary characteristics to form into a strong offshore mid-latitude cyclone - that being low pressure at the surface and upper atmosphere as well as a stubborn high pressure system over New Zealand forcing the low to hang around over the Tasman Sea.

As with any of these complex systems, models differ in strength and location accuracy. Although most models agree a strong low will form, the European model, ECMWF, has pressure as low as 985hPa early Wednesday morning, indicating powerful winds near its core. Sustained winds greater than 90km/h are likely should the ECMWF forecast come to fruition.

This is bad for anyone sailing across the Tasman but great for experienced surfers looking for big waves at protected spots along the east coast of NSW. Hanging mainly far off the southern NSW coast, the low looks to slowly make a circle over the Tasman in a clockwise way on Wednesday and Thursday, held there by the New Zealand high pressure system. This in turn creates a long fetch and time for big waves to form.

By Wednesday, waves in the 6-8 foot range should be pounding the coast, with southwesterly winds. There is uncertainty as to whether the large waves will continue into Thursday as some models have the low moving away quicker than others. Either way, this type of surf-producing storm is unusual for this time of year, so no complaints from surfers. It will also be dangerous for activities like rock fishing so take precautions to stay out of trouble.

- Weatherzone

© Weatherzone 2017

More breaking news

Sydney Morning Herald
ABC News
National Nine News
News Limited

Display Your Local Weather

Weather News

ANZAC Day forecast

11:33 EST

What will the weather be like for dawn services and ANZAC Day marches in Australia's capital cities? Brisbane will be dry with light winds at dawn and the day should stay rain-free, with only the slight chance of a light shower or two.

Perth rainfall is higher than Melbourne, Hobart, London despite reputation for sunny beaches

10:32 EST

Perth may be best known for its idyllic beaches and sunny skies, but the West Australian capital sees more rain than Melbourne, Hobart and London — cities often associated with gloomy, wet weather.

Corals build 'cloud umbrellas' to help keep cool under blazing sun, study says

10:04 EST

Australian researchers have found corals build "cloud umbrellas" to protect themselves from the scorching sun, and say coral loss through bleaching events could have wider ramifications for weather and agricultural production along the Queensland coast.