At least three outgoing and three incoming flights to Launceston have been cancelled as persistent fog and high cloud lingers over the airport on Sunday, with more cancellations and diversions expected.
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The fog could remain until Monday morning as well, leaving hundreds of passengers stranded in Launceston overnight.
Outgoing Jetstar flights JQ 746 to Sydney, JQ 740 to Melbourne and JQ 750 to Sydney have been cancelled, while incoming flights JQ 745 from Sydney, JQ 749 from Sydney and JQ 743 from Melbourne have also been cancelled.
**The latest update from Launceston Airport, including impact for Monday morning**:
Qantas flight QF 2283 missed its approach at 2.12pm and diverted to Devonport.
Passengers have taken to Twitter to vent their frustration at a perceived lack of information being provided by carriers.
Some have complained about being stranded at Launceston Airport for more than four hours as flights were delayed, and have since been cancelled.
There were also claims that passengers were not entitled to overnight accommodation as it was not a fault of the airlines.
But a Jetstar spokesperson said customers "have been offered to either travel on the next available flight at no additional cost, or be given a voucher to the full amount of their booking".
Passengers on board flight JQ 745
In further bad news for those wanting to get to Sydney or Melbourne, the Bureau of Meteorology has confirmed the fog and high cloud was unlikely to clear until Monday morning.
Forecaster Matthew Thomas said there was an "extensive" band of fog south of the airport heading towards Campbell Town and Ross with light winds.
"We've also got a layer of high cloud sitting over the top that's inhibiting the break down of the fog at the airport and to the south," he said.
"There are fairly light winds as well, only three knots at the airport."
A gap in the clouds is approaching Northern Tasmania but has only reached Cape Grim in the far North-West, meaning it could be hours until it arrives in Launceston.
Mr Thomas said it was not guaranteed to clear the fog on Sunday, either.
"We're likely to see more high cloud push across ahead of the approach. That will see the cloud remain overnight tonight then clear as the front crosses tomorrow morning," he said.
"The high cloud acts as a blanket, preventing the sunlight that's needed to break down the inversion that would allow the mixing of the atmosphere.
"We do find that fog about the valleys in Tasmania can persist for long periods at a time."
Fog has descended in various parts of Tasmania in the past week, including in Ouse, where it has persisted since Friday with virtually 100 per cent saturation.