A TOTAL fire ban will be in place for the ACT tomorrow.

Acting ACT emergency services commissioner Tony Graham said with the forecast for a very hot and windy day, the fire danger for the Territory tomorrow would be extreme.

"If a fire starts at the forecast fire danger level of extreme it may be uncontrollable, unpredictable and fast moving flames will be higher than roof tops," the ACT Emergency Services Agency (ESA) said in a statement today.

"There is a very high likelihood that people in the path of the fire will be injured or die."

Today, firefighters were working to extinguish three fires started by lightning in the Namadgi National Park, in the ACT's south.

All three were being controlled.

The ESA was using specialist remote area firefighting teams and a waterbombing helicopter in its efforts to extinguish them.

For information about fires, ACT residents can monitor the ESA website (www.esa.act.gov.au) or its Facebook or Twitter accounts, or contact Canberra Connect on 13 22 81.

Tomorrow, all residents are urged to report any smoke or fire sightings by calling 000.