Residents in parts of Camden have been warned to prepare for possible evacuation due to today's heavy rainfall.
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The NSW SES has issued the call to 'prepare to evacuate' if an evacuation order is issued.
It comes as the situation in nearby Picton stabilises.
The new warning applies for residents and businesses on Sheathers Lane, Kirkham Lane, Menangle Road near Racecourse Road and Poplar Tourist Park.
"Floodwaters may isolate the area," the SES posted on Facebook.
"If you remain in the area, you may be trapped without power, water and other essential services and it may be too dangerous to rescue you.
"Prepare to stay with family, friends or at accommodation outside of the flood area [if evacuation is required]. If you are unable to do so, an evacuation centre location will be advertised."
Earlier: The SES has warned Picton residents and businesses in the CBD to prepare to evacuate.
An evacuation warning, which differs from an evacuation order, is currently in place for the CBD, the SES says.
"The NSW SES is advising people in Picton CBD to prepare to evacuate," NSW SES Wollondilly Unit posted on Facebook today.
"As a result of rising flood waters, people within the Picton CBD should prepare to evacuate.
"Residents should monitor the situation and be prepared to evacuated when instructed to do so.
"The NSW SES will issue a Flood Evacuation Order if evacuation is required."
A flood evacuation warning went out at 9am today for Stonequarry Creek, Picton.
It said "once floodwaters begin to rise in Stonequarry Creek, you will see flooding of roads, sewerage lines and power may be lost, and properties inundated."
"If you remain in the area you may become trapped and it may be too dangerous for NSW SES to rescue you."
The creek did not flood into the town during last month's weather event.
The weather has seen Menangle Bridge closed this morning, and Douglas Park Causeway underwater overnight.
Woodbridge Road at Menangle is also affected.
There is a moderate to major flood warning in place for the Upper Nepean River.
"The [Nepean River at Menangle] is likely to exceed the moderate flood level (9.20 m) around 01:00 pm Thursday and may reach the major flood level (12.20 m) Thursday evening," Wollondilly SES Unit posted.
"The Nepean River at Camden Weir is likely to exceed the minor flood level (6.80 m) around 03:00 pm Thursday. The river level may reach the moderate flood level (8.30 m) overnight Thursday into Friday.
"The Nepean River at Wallacia Weir may reach the minor flood level (5.00 m) overnight Friday into Saturday. Further rises to the moderate level are possible."
Several roads in Camden are also affected by severe weather and localised flooding.
Cawdor Road/Sheathers Lane at Camden and Smalls Road at Grasmere are both closed, while Little Sandy Bridge (Camden) and Macquarie Grove Bridge (Kirkham) are also closed.
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