The worst cyclone to hit Queensland in at least six years lashed the state's north coast over the last two days and the Maranoa region can expect to feel some of the after effects.

Ex-Tropical Cyclone Debbie was downgraded overnight to a tropical low while tracking southwards over the Central Coast, Whitsundays and Central Highlands and Coalfields districts.

But while the system is no longer of cyclone strength, the threats haven't yet passed.

The Bureau of Meteorology has issued a flood watch for coastal catchments between Ayr and the New South Wales border, extending inland to Maranoa and Warrego, the Darling Downs and Granite Belt districts.

As the weather system tracks south, a forecast for rainfall throughout Thursday and Friday are predicted for the Maranoa region.

If current predictions hold, meteorologist Kev Hutchins said Roma, Miles, Chinchilla and Dalby could expect a wet Thursday with rainfalls in the vicinity of 50-70 millimetres.

CYCLONE DEBBIE UPDATE

- The cyclone has been downgraded to a tropical low, but it is still delivering damaging winds and heavy rain.

- Damage from the cyclone has cut all roads to the north Queensland towns of Bowen, Airlie Beach and Proserpine.

- More than 63,000 homes and businesses remain without power in north Queensland

- According to Premier Annastacia Palaszczuk there have been no reports of injury from the Whitsunday Islands

- The Army has sent in a "Duck”, or amphibious vehicle, from Townsville to cyclone-damaged communities.

- Severe weather warnings are in place in multiple regions as Cyclone Debbie continues to trigger flood threats along 1300km of Queensland's coast between Ayr and the New South Wales border.