The SES is preparing for a "wind swing" which will see strong westerly winds experienced over recent days replaced by southerly winds from Tasmania hitting Sydney about midday Thursday.
The system will likely bring wind speeds of 60km/h with gusts of up to 95km/h to the city.
Gusts of 61km/h were record at Sydney Airport at 12.30pm while a gust of 65km/h was registered at Lucas Heights at noon.
A series of cold fronts are skimming across southeast #Australia, associated with a deep low pressure system to the south. Warnings remain current for #DamagingWinds#DamagingSurf and #HazardousSurf: https://t.co/rK0rynsjM2pic.twitter.com/IrBRQh08S4— Bureau of Meteorology, New South Wales (@BOM_NSW) August 22, 2019
At 12.15pm Sutherland Shire SES warned that a major tree operation was underway in Prince Edward Park Road in Woronora where the road has been blocked.
Police and NSW SES crews are working to restore access and motorists are asked to please avoid the area.
Waves are predicted to double in height, with wild winds and surf posing an erosion risk to the entire NSW coastline.
A NSW RFS hazard reduction burn near Helensburgh (adjacent to the Garrawarra Centre) that was scheduled to commence tomorrow has been postponed due to forecast wind gusts on Saturday.
Sydney's coast will be pummelled this week by unusually powerful swells generated by a deep low in the Tasman Sea.
The Bureau of Meteorology has issued a warning for hazardous surf and swell and damaging waves from tomorrow for the Illawarra, Sydney and Hunter coasts.
"Surf and swell conditions developing in the afternoon and evening are expected to be hazardous for coastal activities such as rock fishing, boating, and swimming in the following areas," the Bureau warned.
⚠️ Hazardous #surf warning issued for #Eden to #Macquarie Coasts. From later today, hazardous surf & swell expected for coastal activities such as rock fishing, boating and swimming https://t.co/FPn4DWzX0z@slsnsw@NSWMaritime@MarineRescueNSW@nswpolicepic.twitter.com/8WcW3pTB5H— Bureau of Meteorology, New South Wales (@BOM_NSW) August 20, 2019
Bureau forecaster Jordan Notara said the combination of the deep low and a high pressure system is the source of the big swells.
"Wave heights for offshore Sydney will approach six metres on Thursday. It's quite a rare event, particularly for August", Mr Notara said.
The record wave recorded for offshore Sydney in August stands at 6.41 metres.
The current forecast is a moderation compared with predictions last week that pointed to waves of eight metres or higher during the coming event.
Waves are likely to reach three to four metres on Wednesday, producing hazardous conditions for those on the water, and rough rides for those on Sydney Harbour.
Sutherland Shire Lifeguards posted on social media on Wednesday: "SWELL ALERT: Huge South swell looms for southern exposed beaches here at Cronulla for Thursday & Friday. Extremely hazardous surf 10-12ft + following the development of an intense, slow-moving low pressure system over the southern Tasman Sea."
NSW Maritime advises skippers and owners of small crafts to be on high alert and check the conditions before considering crossing a coastal bar or heading offshore.
Rock fishers should also check weather forecasts before heading out, avoid fishing near dangerous surf and wear a lifejacket.
Every skipper is responsible for the safety of their vessel and all on board.
🌊#Waves vary in height from one to the next. So how do you know what sizes to expect when you get on the water? Our marine forecasts include 'significant wave height'—the average height of the top ⅓ of waves—but some waves can be twice that high: https://t.co/k5jXJeZP0Hpic.twitter.com/Mek7cKaxaC— Bureau of Meteorology, New South Wales (@BOM_NSW) August 20, 2019
Safety Advice *
- People should consider staying out of the water and avoid walking near surf-exposed areas.
- Rock fishers should avoid coastal rock platforms exposed to the ocean and seek a safe location that is sheltered from the surf.
- Boaters planning to cross shallow water and ocean bars should consider changing or delaying their voyage.
- Boaters already on the water should carry the appropriate safety equipment and wear a lifejacket.
- Boaters should remember to log on with their local Marine Rescue radio base, via VHF Radio or the Marine Rescue APP, and consider their safety management plan.
*NSW Police Force, Marine Area Command