Major flooding is likely around the Northern Slopes as wet and stormy weather redevelops over much of New South Wales from Wednesday.
The Bureau of Meteorology (BOM) said the anticipated high levels of precipitation will be the result of a deep low-pressure system interacting with very humid tropical air.
Widespread rainfall is expected to continue across NSW and through the second half of the week. Very intense rainfall rates are likely for some areas, most likely over the north from late Wednesday.
The heaviest rainfall is forecast to contract to the south east of the state through the weekend as the low moves offshore.
The warning comes following a wet start to the week which closed a number of low lying roads in Armidale on Monday.
Road closures were in place due to the flooding of causeways and creek crossings on Dumaresq Street, Beardy Street, Faulkner Street, Dangar Street, Taylor Street and Chapel Street.
Armidale Regional Council chief of assets and services, Alex Manners, asked residents to drive carefully and avoid crossing flooded areas.
"Please use caution, follow the direction of council staff and road closure advice," Mr Manners said.
The weather system is expected to cause moderate to major flooding in the Upper Macintyre River, Gwydir River, Peel River and Namoi River.
Local flooding can be expected at Whalan and Gil Gil Creeks and minor flooding at the Barwon River.
People working or camping along these rivers and creeks should monitor river heights and be prepared to relocate to higher ground.
The Bureau of Meteorology is continuing to monitor the situation and will issue catchment specific warnings should river levels be expected to reach or exceed minor flood level.
Residents are advised to stay up to date with information and listen to flood warnings and follow advice on how to protect yourself, family, and property.
Farmers and landholders are advised to relocate livestock, pumps, and equipment to higher ground
State Emergency Services Incident Controller Mitchell Parker said people should never drive, walk or play in floodwaters.
"Floodwater may be deep, fast flowing and may contain hidden snags and debris," Mr Parker said.
For emergency help in floods and storms, call the NSW State Emergency Service on 132 500.
In life threatening situations call triple zero (000) immediately.
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