Hunter motorists are being warned to take care, with several roads affected by localised flooding across the region.
The Golden Highway is closed at Range Road at Singleton, with diversions in place.
Dave Wright from the Transport Management Centre says it was closed at about 5.30 this morning.
"It was one of our 1233 listeners who called it in first, so we thank them for that," he said.
Also in the Upper Hunter, one southbound lane of the New England Highway remains closed at Parkville because of flooding.
Northbound lanes of Newcastle's Industrial Drive at Tighes Hill were closed earlier this morning but have since reopened.
Mr Wright says fortunately the flooding situation has not been too serious.
"Hopefully with that rain moving off, things may start to settle and the water does tend to drop relatively quickly," he said.
"But the other challenge is washed out road surfaces underneath, so we could actually have some damage."
© ABC 2013
00:16 EST Parts of Sydney and the Blue Mountains have been battered by large hailstones after a severe thunderstorm moved across the area.