Hail briefly swept across the Illawarra's northern suburbs this evening ahead of a huge storm set to hit the region.
The Bureau of Meteorology this afternoon re-issued a severe weather warning for the region, with thunderstorms and heavy rain expected to hit later tonight.
A low pressure system is deepening off the South Coast today, bringing gale force winds and heavy rain to the region as it moves north.
Dangerous surf conditions, hazardous for coastal activities such as swimming, surfing and rock fishing, are expected in the evening.
The heavy surf may also lead to coastal erosion at some Illawarra beaches.
A flood warning for the Shoalhaven River Valley is also in effect, with heavy rain expected in the catchment area.
If the weather system intensifies the bureau will issue flood warnings predicting flood heights at the Nowra Bridge.
The State Emergency Service is advising people in the Shoalhaven to watch the weather and look out for flood waters near their properties.
They are also urging Illawarra residents to move vehicles under cover and away from trees, secure any loose items in and around homes, and keep clear of fallen trees and power lines.
For emergency help in floods and storms, ring your local SES Unit on 132 500.