There will be no respite for flood-hit communities in the south of Wales as fresh bands of heavy rain sweep in from the southwest and across the UK, while a new low pressure system threatens further downpours in the coming days.

Flood warnings have remained in place across Britain for much of the last week, with Wales particularly affected by burst river banks and sodden soil left in the wake of Storm Dennis.

However, despite brief respite offered by subdued and scattered showers on Saturday, the nation is expected to be inundated once again with heavy rain through to the early hours of Sunday and again in the evening.

The Met Office has issued a yellow warning for heavy rain in South Wales from Saturday night to Sunday morning, prompting further concerns a week after a number of towns and villages were first overrun by flood waters.

Despite the Met Office’s decision not to name the latest bout of stormy weather, it is the third consecutive weekend of heavy rain, with swathes of the country still trying to cope with the impact of Storm Ciara and Storm Dennis.

Storm Dennis in pictures Show all 40 1 /40 Storm Dennis in pictures Storm Dennis in pictures Flood water surrounds Upton upon Severn in Worcestershire. Severe flood warnings remain in place in the wake of Storm Dennis, with more rain expected to fall in the week PA Storm Dennis in pictures A husky and its owner are rescued by emergency services after flooding in Nantgarw, Wales after Storm Dennis hit the UK PA Storm Dennis in pictures Waves crash against the harbour wall in Isle of Whithorn Getty Storm Dennis in pictures An employee cleans a nail salon on Market street in Pontypridd after Storm Dennis hits the UK leading to widespread flooding PA Storm Dennis in pictures Flooding from the River Wye Getty Storm Dennis in pictures Laura Court and Louise Bedgood mop up the floor of Lougos hair dressers in Oxford Street, Nantgarw EPA Storm Dennis in pictures A Land Rover wades through flooded roads in the Wye Valley, near the hamlet of Wellesley in Hereford Getty Storm Dennis in pictures A rainbow appears over flooded fields in the Wye Valley Getty Storm Dennis in pictures A firefighter carries a dog to safety as part of ongoing rescue operations due to flooding in Nantgarw PA Storm Dennis in pictures Two men cleaning up the street in Pontypridd PA Storm Dennis in pictures Rescue operations continue after flooding in Nantgarw PA Storm Dennis in pictures Flood water surrounds Upton upon Severn PA Storm Dennis in pictures Members of the public start the clean up following flooding from storm Dennis in Newcastleton, Scotland Getty Images Storm Dennis in pictures Local residents remain cheerful as walk through receding floodwater in Mountain Ash, Wales PA Storm Dennis in pictures A car trapped by debris carried by floodwater, on the road outside the Aberdare Hotel in Mountain Ash, Wales PA Storm Dennis in pictures Flood water surrounds Upton upon Severn PA Storm Dennis in pictures Flood water surrounds abandoned cars left in a flooded street in Tenbury Wells, after the River Teme burst its banks in western England AFP via Getty Storm Dennis in pictures A man rescues a floating plant pot from flood water, outside of a flood-bound house in Tenbury Wells AFP via Getty Storm Dennis in pictures Items float in flood water inside a flooded charity shop in Tenbury Wells AFP via Getty Storm Dennis in pictures Flood damage in Bridge Street, Crickhowell, South Wales Reuters Storm Dennis in pictures A digger is used to clear debris, carried by floodwater, from the road outside the Aberdare Hotel PA Storm Dennis in pictures Flood water surrounds abandoned cars left in a flooded street in Tenbury Wells AFP via Getty Storm Dennis in pictures An Environmental Agency Officer gives a briefing as the River Ouse in York continues to rise potentially causing further flooding as Storm Dennis causes disruption across the country Getty Storm Dennis in pictures A man walks through a flooded convenience store in Tenbury Wells AFP via Getty Storm Dennis in pictures Flood water surrounds abandoned cars left in a flooded street in Tenbury Wells AFP via Getty Storm Dennis in pictures Employees of York City Council use sand bags to increase flood defences Getty Storm Dennis in pictures A van is driven through standing water on a road in Tenbury Wells AFP via Getty Storm Dennis in pictures A footbridge in Pontypridd is blocked by debris after Storm Dennis hit the UK PA Storm Dennis in pictures Waves crash over the lighthouse at Porthcawl, South Wales Reuters Storm Dennis in pictures Members of the 4th Battalion Royal Regiment of Scotland erect flood barricades in Ilkley, West Yorkshire AFP via Getty Storm Dennis in pictures Bricks and debris cover damaged cars after part of a building collapsed in Herne Bay AFP via Getty Images Storm Dennis in pictures An empty coach sits abandoned in flood water after the River Teme burst its banks near Lindridge AFP via Getty Images Storm Dennis in pictures Standing water on a road in Tenbury Wells AFP via Getty Storm Dennis in pictures A firefighter carries a dog to safety as part of ongoing rescue operations due to flooding in Nantgarw PA Storm Dennis in pictures A rescue boat is lifted from the water by Mountain Rescue crews after a river patrol on the River Ouse in York Getty Images Storm Dennis in pictures Flood water surrounds grave stones in a graveyard in Tenbury Wells AFP via Getty Images Storm Dennis in pictures One-year-old Blake is carried by a rescue worker as emergency services continue to take families to safety PA Storm Dennis in pictures A dog and its owner are rescued by emergency services after flooding in Nantgarw PA Storm Dennis in pictures A car passes over Teston Bridge near Maidstone in Kent PA Storm Dennis in pictures An aerial view of the Welsh village of Crickhowell which has been cut off Getty Images

On Saturday evening, nine flood warnings remained in force across Wales – mainly on the River Severn and River Dee – with 10 flood alerts. Meanwhile in England 75 flood warnings and 156 flood alerts remained in place.

On Monday morning the grim weather is set to continue, with a yellow weather warning for heavy rain being issued from 3am to 3pm in Scotland, Northern Ireland and the northeast of England.

Dan Suri, chief forecaster at the Met Office, said: “A relatively deep area of low-pressure system on Monday provides a continuation of the extremely unsettled period the UK has endured.

“Despite reports to the contrary, this system hasn’t been named, and there is no plan to do so currently, despite some speculation on social media.

“With further rain in the forecast over the coming days, additional rainfall could create further challenges as river catchments are more likely to respond to extra rainfall more quickly. Flooding, especially in areas already heavily affected, remains a possibility.”

Scott Squires, duty tactical manager for Natural Resources Wales, said: “As the flood waters recede and communities start to get back on their feet, we’ll continue to support local authorities and emergency service in these affected areas.