Communities around Britain are dealing with another day of flooding and travel chaos
A woman is believed to have died in floodwater near Tenbury Wells in Worcestershire
More than 200 flood warnings are in place
That includes six severe flood warnings, meaning there is a danger to life
The heavy rain in south Wales has blocked a number of roads and damaged rail lines
Worcestershire, Shropshire and Herefordshire are among worst affected areas
The environment secretary defends the government's response
Lydney Rugby Club, in Gloucestershire has flooded, along with several other parts of the county.
There are currently 15 flood warnings in place in the area, and several roads have been made impassable.
Image source, David Arnott
Image source, David Arnott
Image source, David Arnott
Image source, David ArnottA search is under way for a woman, believed to be in her early 20s, who is missing after going into the water in Brighton.
Police were called at 02:45 GMT on Sunday and emergency services carried out a search overnight.
The search is ongoing.
A spokesman for Sussex Police said: "The weather has been very bad, with rain and high winds. The circumstances are currently being treated as unexplained but not suspicious."
South Wales Police, on behalf of the area's resilience co-ordination group, has declared a major incident in the wake of serious disruption caused by adverse weather across the south Wales region.
The authorities are dealing with multiple floods and landslides, and have evacuated residents from their homes.
Emergency centres have been set up for those affected for residents who have been displaced.
Assistant Chief Constable Jennifer Gilmer, said: “I would like to reassure the public who have been affected that we are doing everything we can, and will continue to work tirelessly until all risks dissipate. “
"I would like to thank all our emergency services and rescue partners for their assistance and professionalism. I have very clear advice for everybody, which is not to panic, and to be sensible - stay well clear of any danger such as streams and rivers, and contact us in an emergency.”
Jessica Falk Perlman and her family are stuck in the upstairs of their holiday rental
Jessica Falk Perlman tells BBC News she was informed at 04:00 GMT that her family needed to evacuate their holiday home in Powys, Wales, because the river was about to burst its banks.
However, the problem escalated so quickly the family are now stranded and are waiting for an update from the emergency services.
"All of the ground floor of this holiday let that we are staying at is completely submerged," she says.
She adds that she can see inflatable boats being used outside, and that the area is completely cut off. Her car is also submerged in water.
"It's rubbish for all the people who live here, really, and all the local businesses aswell."
Within 30 minutes of being warned that the river was going to burst, two metres of water began entering the property, she says. The front door was also knocked down.
The flooding visible from Jessica's holiday rental
In Llanover, Monmouthshire, Wales, Amy Price's house has been badly affected by flooding.
"The river started rising about 01:00 GMT and at 03:00 GMT it started coming into the house," she says.
"We started sweeping the water away and then at 06:00 GMT the river started coming over the bank."
The ground floor of her home is completely flooded, with water reaching as high as the light switches.
The family tells the BBC that they are trapped in the upstairs of their home and are waiting for the water to recede.
Image source, Amy PriceAmy Price's home is one of hundreds to have been flooded in Wales
Rail services in the south of England remain disrupted due to severe flooding on lines.
Flooding at Brockenhurst in the New Forest means trains are unable to run between Southampton and Bournemouth.
There is also flooding blocking lines at Hedge End in Hampshire.
Image source, Marin GalpinYou can check how Storm Dennis may have impacted on trains in your area on the National Rail Enquiries, external website.
The number of severe flood warnings issued in England has doubled - from two to four.
All the severe flood warnings centre on the River Teme, in both Herefordshire and Worcestershire.
In Herefordshire, warnings have been issued both at Ludlow and at Little Hereford and Ashford Carbonel.
In Worcestershire, the severe warning is in place in Eardiston and at Tenbury Wells and Burford.
The "danger to life" red weather warning issued for Wales this morning is no longer in force, the Met Office says.
Earlier today, a red warning for rain was issued for south Wales. It was in place until 11:00 GMT.
As we reported yesterday, the army has been helping officials with flood relief efforts in West Yorkshire.
But BBC Yorkshire is reporting a warning by Calderdale council that a person is impersonating an official and asking for donations to a flood fund.
Calderdale Council said the person is pretending to be from "gold command" - an organisation set up during emergencies to co-ordinate a response with the emergency services.
The council has asked people not to donate to people at the doorstep, but instead to use the official online flood fund.
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Storm Dennis has brought disruption to travel. Earlier today a train struck a tree blown on to the tracks while travelling between London and Cambridge, Thameslink has said.
The service came to a halt at the Ivy Farm level crossing between Royston, and Ashwell and Morden at about 07:30 GMT.
The tree was removed by 08:45 GMT and the train only saw "light damage".
A Thameslink spokesman said the line had reopened but that there might be some delays
He added: "The general advice is to not travel unless necessary."
A video showing the ferocity of the water at the Pontsticill reservoir, in the Brecon Beacons, has been posted on social media by Welsh Water.
The water services company says colleagues are dealing with "difficult conditions".
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More on the flooding from Wales. The River Taff has burst its banks, with water spilling onto residential streets.
A video and image posted on social media by Pontypridd Town councillor Heledd Fychan shows the damage caused, with cars stranded and the water now knee high.
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Amy Price, from Llanover, told BBC Wales: “The river started rising about 1am and at 3am it started coming into the house. We started sweeping the water away and then at 6am the river started coming over the bank.”
The ground floor of her home is completely flooded with water reaching as high as the light switches.
The family are trapped in the upstairs of their home and are waiting for the water to recede.
Image source, Amy PriceMore images are emerging of people being rescued from severe flooding in Nantgarw, south Wales.
Image source, PA MediaA person is rescued with their dogs
Image source, PA MediaRescue workers continue to wade through water to help residents to safety
Image source, PA MediaPeople wait to be rescued after becoming stranded
Image source, PA MediaSome require assistance after becoming trapped in their homes overnight
Extreme weather is affecting rail services across the country.
Passengers have been advised to check journeys online for any disruption.
Delays or cancellations were reported on:
Southern Scotland was hit with severe flooding overnight
A couple have been rescued after their car was swept from a road during severe flooding in southern Scotland.
Firefighters and other rescuers waded into the water to help them to safety when the vehicle became wedged against a gate near Newcastleton.
Image source, CARLISLE EAST FIRE STATIONA car was swept from a road during severe flooding
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The village of Newcastleton and the town of Hawick in the Scottish Borders were both hit by severe flooding overnight in the wake of Storm Dennis.
A number of homes were evacuated and rest centres were set up for displaced residents.
Rest centres were set up overnight for evacuees in Teviotdale leisure centre and Newcastleton community centre.
More than 40 flood warnings remained in place on Sunday morning across Scotland and a Met Office yellow warning for high winds was due to start at midday.
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A resident who lives in the hamlet of Pontrilas in South Herefordshire, close to the border with Wales, has said she's had "catastrophic" flooding for the second time in four months.
Sarah Bridge, 55, has lived in her property for five years. When she moved in she was told it had only flooded once in 50 years.
She says her neighbours are in "shock", adding: "Storm Dennis came like a tornado. It hit us very badly Saturday evening."
Despite having specialist flood doors installed after a flooding episode in October, the water "just came straight through those".
She adds: “We had the pumps going trying to pump out as much water as we could but it came up to my knees and it got too dangerous to be there.
“My husband and I retreated upstairs. It’s heartbreaking. The kitchen is completely flooded, I can hear things floating about downstairs.”
Image source, Sarah Bridge
Image source, Sarah BridgeThese pictures have been taken by a family who have been stuck in their house in Nantgarw, near Pontypridd in South Wales. Floods have hit many areas of Wales.
Image source, Tracey Newman
Image source, Tracey NewmanResidents in Nantgarw, south Wales, had to be helped to safety on Sunday as heavy rainfall overnight led to severe flooding.
Image source, PA MediaFamilies being rescued from flooding in Nantgarw, south Wales
Image source, PA Media
Image source, PA MediaSubmerged vehicles in Nantgarw, south Wales, as severe weather warnings are issued