WX Charts predicts heavy downpours of up to 10mm per hour hitting parts of Northern Ireland and southern Scotland, including Dumfries, by 6am.
By 9am, the rain is expected to spread across northern England, affecting areas like Lancashire, Central, Tayside, and Fife, and northern Scotland, including the Highlands. Around 5mm of rain is expected at this time in North East England and central and coastal areas of Scotland.