The Bureau of Meteorology also indicated that rain totals could reach up to 40 millimeters within just 30 minutes, with a recent gauge near Newcastle recording 45 millimeters in that timeframe.

A major storm impacted the Sydney CBD around midday, resulting in 40.6mm of rainfall recorded at Observatory Hill since 9am.

Meteorologist Helen Reid warned that damaging wind gusts could exceed 90 kilometers per hour, with hail potentially larger than 2 centimeters.

Severe weather conditions are expected across several suburbs in New South Wales, including Gosford, Sydney, Orange, Katoomba, Dubbo, and Parkes.

On February 10, 2025, thunderstorms in New South Wales and eastern Victoria are predicted to bring risks of flash flooding, destructive winds, and large hail, according to the Bureau of Meteorology.

The State Emergency Service (SES) has advised residents in Bowral, Orange, Bathurst, Katoomba, Forbes, and Cowra to stay indoors during the storm.

This extensive weather system is linked to a surface trough in a moist, unstable air mass, combined with an upper trough moving eastward across New South Wales.

By late morning, the storm was moving over the Blue Mountains and western Sydney, with expectations to reach the city around midday.

Further thunderstorms are anticipated into the late afternoon and evening, with less severe storms expected on February 11 before conditions begin to improve on February 12.

Rainfall totals leading up to 9am on February 10 included significant amounts, such as 89mm in Murrumburrah and 61mm in Coonabarabran.

In Victoria, heavy rainfall is expected to continue in east Gippsland, with severe thunderstorms possible in the north-eastern regions, potentially affecting Melbourne's outer suburbs.

Residents in central and eastern NSW and eastern Victoria are urged to monitor updates from the Bureau of Meteorology and local authorities regarding the severe weather.