Tumut, Bathurst, Narrabri and Orange are among the places to break November rainfall records, the Bureau of Meteorology says, in a month that has seen major flooding inundate towns such as Forbes and Gunnedah.

A "tropical air mass with abundant moisture" on Tuesday night drove severe thunderstorms in the state's north and west, with BOM warning flash floodings, damaging winds and large hailstones were possible.

It also predicts the first day of December will be soggy too, with more rain threatening catchments already at risk of flooding in the northern rivers region of NSW.

A flood watch was issued on Tuesday for rivers there and on the mid-north coast, with possible renewed river level rises in the northwest slopes as well.

While flooding has eased at Gunnedah along the Namoi River, with locals now preparing to assess the damage, further downstream, in Narrabri and Wee Waa major flooding continues.

Bugilbone is also experiencing moderate flooding.

Authorities are also closely monitoring the Macquarie River as it heads through the central NSW town of Warren, where there is major flooding.

The swollen Lachlan River also continues to cause flooding, with the river reaching moderate levels at Forbes, Condobolin and Cottons Weir.

Major flooding is occurring in Jemalong.

Inglewood in southeast Queensland also has major flooding, with the flows expected to cause major flooding in the border town of Texas from Wednesday afternoon.

The primary areas of concern for the SES are Narrabri, Wee Waa, Gilgangra and Gunnedah, with 11 flood rescues performed across NSW in the past 24 hours.

Depending on how much rain falls in the next couple of days, flooding is expected to continue across the state next week as water moves down the river systems.

"We're really hoping to get some respite from some of the rainfall but every day we seem to be getting more and more rain across those flood-affected areas," BoM flood operations manager Justin Robinson said on Tuesday.

Australian Associated Press