A yellow Met Office warning has come into force until early Sunday.
Forecasters say heavy rain could bring flooding, travel disruption, and even power cuts.
Up to 100 millimetres may fall in just a few hours, with strong winds and thunder adding to the risk.
Areas affected include Greater Manchester, Lancashire, Merseyside, Cheshire, Cumbria, and beyond.
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Developer appeals rejected Broughton housing plans
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