The Environment Agency has re-issued its earlier warning that there could be a risk of flooding from rivers and surface water during Friday and Saturday.
The exact locations of the bad weather are unknown at the stage, however a weather system of thunder showers and slow moving bands of rain is likely to affect eastern parts of Lancashire towards Todmorden - but the forecast could change and other areas might be affected.
Steve Moore, Director of the Environment Agency in the North West region said: “Our latest forecasts show that over the next 36 hours, some parts of the North West region could experience very heavy rainfall.
“We are experiencing a period of very unsettled weather and, where necessary, our teams are out monitoring river levels and ensuring that blockages to rivers and drains are removed.”
The public are encouraged to remain vigilant and those concerned about flooding can call Floodline 0845 988 1188.