Wild weather in Tasmania knocks out phone coverage, power, as ...

The prolonged extreme weather event affecting Tasmania has left around 30,000 people without power, with residents in a one community being told they should prepare to leave due to a flood risk.

The Bureau of Meteorology says damaging winds remain possible across the state today, with "possible destructive winds redeveloping in the north and west this evening and early Monday".

A major flood warning urging residents near New Norfolk, in Tasmania's south, to prepare to leave has been issued by the State Emergency Service.

It follows several days of severe weather conditions, including damaging wind and heavy rainfall, that left about 30,000 TasNetworks customers without power early on Sunday.

Saturday's night's Spirit of Tasmania crossing was cancelled due to the conditions.

SES Tasmania executive director Mick Lowe said there had been widespread wind and rain damage across the entire state.

There has been around 330 requests for assistance over the past 24 hours, he said, adding "we're expecting those winds to pick up again tonight".

Mr Lowe said flooding near Meadowbank was now likely to occur on Sunday afternoon and the evening.

An evacuation centre has been set up at the Derwent Valley Sports and Recreation Centre, 50 Derwent Terrace, New Norfolk.

The Spirit of Tasmania crossing from Devonport to Geelong on Saturday night was cancelled. (ABC)

The SES said during the next two to three days, some properties in the area likely to become isolated or inundated with flood waters.

The warning was issued just after 6am on Sunday morning.

"We're still working through a bit of a bit of a backlog there, which has been triaged at the moment, and that is coming off already a busy week," Mr Lowe said.

"We're urging people in the area below Meadowbank to Macquarie to prepare to leave their homes and businesses.

"There is the potential for properties to be inundated and roads to become inaccessible through this afternoon into this evening."

Authorities warn the severe weather is not over, with more high winds predicted later on Sunday. (Supplied: Tina Grant)

Mr Lowe said more damaging winds were expected across the state.

"We've got a bit of a lull at the moment, but we are expecting those winds to pick up with damaging winds again tonight," he said.

The public is urged to stay up to date with the latest flood watches and warnings on the BOM website.

A number of roads are blocked across the state, with a list of closures on the Tasmania Police website.

Residents in the Huon region have been asked to conserve water because of a power outage at the Glen Huon water treatment plant.

The SES attended to fallen trees at Riverside, near Launceston. (ABC News Georgina Burgess)

A TasNetworks spokesperson said there were widespread outages reported and likely to increase over the course of Sunday, warning that delays to fix the outages will be lengthy.

TasNetworks said it received reports of a power transformer fault in Launceston at 10pm last night, which left residents in Launceston, Riverside, Trevallyn and West Launceston without power.

The electricity operator is urging the public to only call to report downed power lines or damage to electrical equipment, with power outages to be reported online.

"Our highest priority is the safety of our people and the community. We have all available resources, including external contractors, working to make safe," a spokesperson said.

"We're experiencing an extremely high volume of calls to our fault centre. We ask our customers to please only call our fault centre if you see power lines are down or damaged."