More than 25 areas of London are on flood alert again tonight due to a combination of heavy rain and high spring tides.
After weeks of rainy weather it's now official - it is the wettest January for more than a century.
An unseasonably mild month could help make this January the wettest since 1766
Assistant Chief Fire Officer Simon Moore said Mr Cox was not on a call at the time.
He added: "The circumstances of his death have not been established. We are saddened and upset by this tragic news and our thoughts are with his family and colleagues at this very difficult time."
Mr Cox, 53, who was known as "Biff", died at around 6pm after collapsing at the fire station, the Surrey branch of the Fire Brigades Union said.Colleagues tried to resuscitate him but were unable to save him.Richard Jones, the brigade branch secretary, said:
Biff was a lovable character with a larger than life personality. He will be sadly missed and fondly remembered by his colleagues. Our thoughts are with his loved ones at this time.
Fire Services, charities and individuals from the service across the country have sent messages of condolence to Surrey Fire and Rescue after the death of a firefighter at Staines.
Our thoughts are with the family and friends of the @surreyfrs firefighter who died last night.
Our deepest sympathy to the family, friends & colleagues of the firefighter from @surreyfrs who very sadly died this evening. Such sad news
Our thoughts go out to the family, friends, and colleages of the Firefighter from @surreyfrs who died on duty. RIP
It is with profound regret that I have to inform you of the death of Firefighter Clifford Cox at Staines Fire Station earlier this evening. We are deeply saddened and upset by this tragic news and our thoughts are with his family, friends and close colleagues at this very difficult time.
FF Cox was based at Staines Fire Station on Green Watch, having served in Surrey for nearly 25 years. He will be greatly missed by the Service and his colleagues.
– Surrey Fire and Rescue Service statement
This is understandably a very difficult time for all, particularly in light of the on-going major incident and the demands placed on all staff.
Welfare arrangements are in place for the crews of both Staines and Sunbury who were involved.
Clifford Cox died at Staines fire station last night, Surrey Fire and Rescue Service said. His next of kin and family have been informed.
Chief fire officer Russell Pearson said Mr Cox was part of the station's Green Watch, and had served as a firefighter in Surrey for nearly 25 years.
Surrey Fire and Rescue have confirmed the death of a firefighter who was on duty at Staines fire station.
Next of kin have been informed.
People in flooded areas have "nothing to panic about" from contaminated water if they keep washing their hands Public Health England (PHE) says.
Debbie Stark, a consultant with Public Health England's Devon, Cornwall and Somerset Centre, said: "Advice has been given regularly to local people about minimising any health risk.
"This includes avoiding contact with flood water, washing hands and food preparation surfaces and not eating food that has touched flood water."
She was responding to claims that flood water in Somerset is contaminated with bacteria.