Parts of Britain are set to be smashed by up to four inches of rain and 60mph winds over the next 24 hours.
Up to 1.6in (40mm) of rain could fall in areas of Scotland and Northern Ireland this afternoon and overnight into tomorrow, although much of England will enjoy sunny weather with 57F (14C) temperatures.
But the conditions will become more widespread, with the Met Office warning tomorrow afternoon and evening could see up to 2in (50mm) of rain and 60mph gusts in southern England, Scotland and Northern Ireland.
Conditions are not likely to improve in time for Armistice Day this Sunday, with rain and 52F (11C) temperatures expected in southern England as the royals gather for the National Service of Remembrance in Whitehall at 11am.
Autumn trees surround a house near Wanborough in Surrey today, as parts of Britain prepare for a wet and windy 24 hours
The Tommy War memorial at sunrise this morning in Seaham, County Durham, ahead of the weekend commemorations
The wet and wild conditions are due to a cold plunge of air across the US which is disturbing the jet stream – the core of strong winds above the earth that carry low pressure systems across the Atlantic Ocean towards Britain.
In today’s weather warning for Northern Ireland and Scotland, the Met Office said a narrow zone of heavy rain is expected to develop over the Irish Sea during the day and affect some adjacent regions.
Eastern parts of Northern Ireland and parts of the far West and South West of Scotland may see heavy rain, especially in coastal areas, with the possibility of 0.8in (20mm) to 1.6in (40 mm) falling in some places.
Forecasters also warned of heavy rain along with spray and flooding potentially leading to difficult driving conditions and some road closures between 4pm this afternoon and 4am tomorrow morning.
The warning for tomorrow, which runs from 1pm until midnight, says spray and flooding on roads will make journey times longer, and some delays to road, rail, air and ferry transport are expected.
Eastern parts of Northern Ireland and parts of the far West and South West of Scotland may see heavy rain this afternoon
The wet and wild conditions are due to a cold plunge of air across the US which is disturbing the jet stream – the core of strong winds above the earth that carry low pressure systems across the Atlantic Ocean towards Britain
Conditions for tomorrow (pictured) are expected to be wet and windy in South West England and parts of Scotland
Rain and 52F (11C) temperatures are expected in southern England for the National Service of Remembrance on Sunday
The Met Office has also warned of delays for high-sided vehicles on exposed routes and bridges, some short term loss of power and coastal routes, sea fronts and coastal communities being affected by spray or large waves.
Forecasters said a band of heavy rain is expected to move east during tomorrow with 0.6in (15mm) to 1in (25mm) of rain falling widely – and even 2in (50mm) over higher ground.
This will be in addition to other spells of heavy rain earlier in the week affecting a similar area, the Met Office said. Rain will be accompanied by strong winds with gusts of 50mph possible inland and perhaps 60mph on coasts.
Saturday should be largely dry, but there could be heavy scattered showers on southern and western coastlines. Sunday will then be dry and sunny in the North, but there will be heavy showers and strong winds in the South.