Roofs were torn off houses, trees blew down and walls collapsed as a small "tornado" tore through Greater Manchester during Storm Gerrit.

Police declared a major incident in Tameside at about 23:45 GMT on Wednesday "due to the severity of the damage caused and potential risk to public safety".

Around a hundred homes have been damaged and people are being asked to avoid the area.

There have been no reported injuries.

The Millbrook and Carrbrook areas in Stalybridge were worst affected.

Stalybridge resident Kerry Hogan told BBC Radio 5 Live the tornado "lasted a minute, 90 seconds, literally a whirlwind of madness".

"We couldn't open the front door as the wind was that bad," she said. "It sounded horrendous, it was very, very loud.

"Lamp-posts were swaying, we watched trees topple like dominoes.

"All the neighbours were out, it was bedlam.

"People have had cars crushed.

"It was horrific and how nobody has been hurt is unbelievable."

Carrbrook resident John Spence told BBC Radio Manchester: "I thought the windows were going to come in."

He said he had never experienced anything like it.

"I was scared of going out," he said. "It snapped my flagpole like a twig and took a tree down in my back garden that fell on the conservatory."

Elsewhere in the UK Storm Gerrit has brought flooding and disrupted travel, with Scotland worst affected.

The north-west of England, the southern coast, Wales, and Northern Ireland were also covered by Met Office yellow weather warnings on Wednesday, with heavy rain and wind battering them.

BBC weather presenter Matt Taylor said there had been a "big clutch of thunderstorms" across Greater Manchester and the Met Office said that "it is likely that it was a tornado which brought the damage to Stalybridge".

"It was just a small, short-lived tornado and that's why the damage was limited to quite a small area," he said.

Fire and ambulance crews joined officials from Electricity North West and the council at multiple sites across Tameside. A rest centre was set up at Dukinfield Town Hall.

A tree has crashed through a roof on Grenville Street in Millbrook, with residents evacuated by the emergency services late at night.

In the daylight they are confronted with the impact of what has happened and are waiting by the police cordon to find out when they will be allowed back inside.

Residents said their houses shook and they heard a loud roaring sound and they feel they were lucky they were not hurt.

They think it only lasted for about 30 seconds, but in that short time, the lead lying on the ground, which is too heavy to lift, was blown off their roofs and onto the cars below.

Mr Taylor added: "What is quite surprising to many is that we actually see more tornadoes per square mile here in the UK than anywhere else in the world.

"But like we saw in Stalybridge they're usually very small, they don't last long, and so we don't really notice them as much as you do in other parts of the world.

"Tornadoes, whatever their size, can cause huge amounts of damage. You can see short and longer spells of very intense winds of over 100 miles an hour. Hence you can see damage to buildings, to property and trees and various other structures brought down quite quickly."

Greater Manchester Police said the damage had been caused "due to a localised tornado".

Ch Supt Mark Dexter said: "This incident has undoubtedly affected numerous people in the Stalybridge area with many residents displaced from their properties during the night.

"Our highest priority is keeping people safe which is why we are advising those who have been displaced not to return or enter their properties which have significant damage until they have been assessed by structural engineers."

He added: "I would also like to urge members of the public to avoid the area where possible and take extra care when travelling in vehicles on the roads in Stalybridge and the surrounding areas, due to debris in the road.

"This has understandably caused some disruption and, though we are not yet in a position to confirm when the area will return to normal, further updates will be communicated when we have them."

Greater Manchester Fire and Rescue Service said crews were called "to multiple reports of damage to various sites and properties in Stalybridge at about 23:00 and worked to make homes and residents safe until 07:00.

The Association of British Insurers (ABI) reassured people and businesses affected that insurers would be available to provide help and support.

Spokesman Malcolm Tarling said: "Insurers expect and are ready for any type of bad weather, such as tornado-force winds.

"When bad weather strikes, their priority is always to help and support their customers recover as quickly as practical. Anyone who has suffered damage should contact their insurer for advice."