The Met Office has issued a yellow weather warning which came into force at 9am (September 20) until 6am Sunday. It has been warned that heavy rain could possibly lead to flooding and disruption to travel. The rainfall is expected to be slow-moving during Saturday morning before making erratic eastward progress, eventually clearing early on Sunday. The Met Office said further changes to the warning area are possible. The warning has been issued to the North West, most of Wales, parts of the Midlands, Yorkshire and the North East.