Flood warning for SA's far north

Communities in South Australia's far north risk being cut off by flood waters with up to 80mm expected in the region over the weekend.

A trough moving over parts of the North West and North East pastoral districts from Saturday afternoon could bring rising creek levels and localised flooding, the SES says.

Chief officer Chris Beattie has urged people not to try and cross flood waters and says communities are unlikely to be isolated for long.