UPDATE: EMERGENCY workers have been flown into Hay to help with the evacuation.
The Riverina town's 3000 inhabitants have been told to evacuate by noon tomorrow.
Buses have been organised to transport inhabitants to a tent city which has been established 120km south at Deniliquin.
The flooded Murrumbidgee River is expected to threaten the town on the weekend and peak on Tuesday.
Hay Shire Mayor Bill Sheaffe expects the town's system of levees to hold but the SES says the Murrumbidgee is expected to peak above the levee's certified height.
The SES has today established a mobile command centre in the town.
Eight aircraft transporting 20 SES and 45 Rural Fire Service volunteers also landed in Hay today.
Aside from helping with the ongoing sandbag effort, the volunteers are conducting a door-knock of the town to advise residents of the evacuation order and offering advice and support.
Community meetings are also being held in Hay to inform the community of the current situation, predictions and information on what to do and how to prepare for evacuation.
NSW SES Murrumbidgee region controller, James McTavish, has praised the efforts of the volunteers.
"These men and women selflessly give up their time to help communities like Hay and Darlington Point in times of need.
"The spirit of flood-affected communities has bolstered our volunteers in the field and we thank everyone for their assistance across these flood events.''
Deniliquin's Memorial Park has been selected as Hay's home away from home.
A temporary recreational and dining area, portable toilet and shower blocks have already been located at the park, with eventual accommodation expected for 500 people.
Organisers expect to erect about 50 big tents to house those seeking shelter.