The NSW State Emergency Service (SES) are warning residents in the Mount Gunderbooka area to prepare for possible minor flooding as the Bureau of Meteorology (BOM) warns of heavy rainfall across parts of far north western NSW.

Flooding was occurring along the Paroo River, roughly 200 kilometres west of Bourke, at the Willara Crossing, according to a midday update from the SES.

The emergency service says people in low-lying areas along the river should stay informed on local conditions.

“Prolonged rainfall means flash flooding remains a significant risk, particularly where heavy rain falls in a short period,”  SES Deputy Western Zone Commander Joshua Clark said.

“We are asking communities to stay informed, remain prepared and be ready for changing conditions.”

At this stage, the BOM says river levels along the Barwon-Darling River are expected to remain below minor flood levels, but localised flooding is possible.

A severe weather warning is also in place for parts of three states and the Northern Territory, including heavy rainfall.

SOURCE: BOM

Residents in Tibooburra, Broken Hill, Wilcannia, White Cliffs, Wanaaring and Menindee are being advised to stay indoors and avoid unnecessary travel during severe weather.

While the storms approach the western boundaries of Bourke and Cobar Shires, the BOM currently doesn't predict falls travelling much further east over the coming week.