Parts of New South Wales are bracing for wild weather as severe thunderstorms sweep across the state, bringing the risk of flash flooding, torrential rain, and hazardous surf conditions.
The Bureau of Meteorology (BOM) issued warnings on Saturday morning after detecting a severe thunderstorm system likely to unleash heavy rainfall capable of triggering flash flooding. The system is expected to hit the NSW Central Coast mid-morning, particularly around Spencer, Lower Mangrove, and Mount White, before moving towards Calga by midday.
Sydney has already experienced significant rainfall, with North Parramatta recording 35 millimetres in just 30 minutes. BOM meteorologist Angus Hines warned that rainfall totals could vary widely, with coastal communities likely to bear the brunt of the storm.
“The forecast is showing quite a wide range, and that’s when thunderstorms are key contributors to rain,” Mr Hines said. “Some suburbs closer to the coast might cop the brunt of it, 50-70mm, while other parts could get 10-20mm.”
In addition to heavy rainfall, coastal areas face the threat of dangerous surf. Cronulla Beach has been included in a damaging surf warning, with waves expected to reach up to five metres. Mr Hines cautioned that the hazardous swell could extend further along Sydney’s coastline.
“It could push into the Sydney coastline. Rough seas are expected on Sydney’s waters, and it could create dangerous coastal conditions,” he said.
The NSW State Emergency Service (SES) has urged residents to exercise caution during the storms. Authorities warn against approaching fallen powerlines, creeks, storm drains, or any flooded areas. Residents are reminded not to walk, ride bikes, or drive through floodwaters, as even shallow water can pose life-threatening risks.
“Stay clear of areas that could quickly fill with water. Even a small amount of fast-moving water can be extremely dangerous,” a spokesperson said.
The warning comes as communities along Victoria’s Great Ocean Road continue recovery efforts following last week’s record-breaking “rain bomb,” which caused widespread flash flooding. Torrents of water swept cars into the sea and forced the evacuation of hundreds of campers and residents from coastal towns.
More than 180mm of rain fell in less than five hours on Thursday afternoon, overwhelming drainage systems and sending fast-rising water surging through low-lying areas in Wye River, Kennett River, Cumberland River, Lorne, and Apollo Bay. Emergency services conducted multiple rescues as flooding cut off sections of the Great Ocean Road and damaged homes and vehicles.
Authorities in Victoria have warned residents to remain vigilant as communities recover, noting that flash flooding can occur quickly even after initial waters have receded.
Back in New South Wales, authorities are monitoring the storm system closely, with the SES urging residents to stay informed via local alerts and weather updates. Emergency services are ready to respond to flooding, fallen trees, and other hazards as the storm progresses.
For those affected, the SES advises contacting them immediately in emergencies by dialling 132 500. Residents are also encouraged to prepare by securing loose outdoor items, checking storm drains, and planning safe routes in case of evacuation.
As thunderstorms continue to develop across New South Wales, meteorologists caution that conditions may change rapidly, and residents should avoid complacency. The combination of heavy rainfall, flash flooding, and hazardous surf presents a dangerous mix for coastal and inland communities alike.
Authorities are urging the public to follow official warnings, exercise caution, and prioritise safety until the storm passes.
