The Met Office has issued a rare "red weather warning" as Storm Dennis peaks in intensity.
The "danger to life" alarm has been sounded for central Wales, with dangerous levels of flooding expected.
The danger zone is above Cardiff, stretching from Neath to Pontypool.
More heavy rain is forecast to fall on Sunday morning, increasing the likelihood of high impacts on residents.
Between 100 and 140mm of rain will fall over higher ground in south Wales.
The rain will eventually ease up in the middle of the day.
While the Met Office's amber weather warning essentially means get prepared for severe weather to impact daily activities, the red warning is a direct call to take action.
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The Met Office is warning those in the affected area to prepare for:
- Danger to life from fast flowing or deep floodwater
- Extensive flooding to homes and businesses is likely
- Collapsed or damaged buildings or bridges
- Road closures and bus and train service delays and cancellations
- Dangerous driving conditions because of spray and flooded roads
- Loss of power and other essential services, such as gas, water, mobile phone service
- Communities could be completely cut off by floodwater, perhaps for several days
Those in affected areas should be preparing their home to be hit with flooding, and follow the government's official advice on how to stay safe.
It's advised to stay away from swollen rivers and not to walk or drive through flood water, as just 30cm of flowing water is enough to move a car.
"Never drive through flood water," the Met Office warns those who have to travel during times of heavy rain.
"If the road is flooded, turn around and find another route. The number one cause of death during flooding is driving through flood water, so the safest advice is turn around, don't drown."
The rest of the UK has also seen travel disruptions amid heavy rain and strong winds. Fallen trees have caused a number of rail services to be disrupted or cancelled in England.
Storm Dennis has been dubbed a "bomb cyclone" after undergoing the process of "bombogenesis", a sudden drop in pressure within the storm system which can draw hurricane-force winds.
- Weather Forecast
- UK Weather
- Met Office
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