The Met Office has issued a weather warning over heavy rainfall and high winds expected to hit Greater Manchester throughout the day on Friday.
There are fears a month's worth of rain could fall, with forecasters saying flooding was possible.
The yellow-coded warning is currently in force from 8am on Friday right through until 10pm at night.
The Met Office said strong gusts of wind were also predicted.
The warning, issued today, said the worst of the weather was expected to hit Greater Manchester during the evening rush-hour.
Spray and flooding on roads and motorways could cause hazardous driving conditions.
Forecasters also predicted public transport problems.
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Bus and train journeys will 'probably be affected' and the Met Office added: "Flooding of a few homes and businesses is possible."
Forecasters said: "Rain is expected to become widespread and heavy at times during Friday.
"Heavy rain may also coincide with peak travel times during the afternoon and early evening leading to difficult driving conditions on major routes.
"The heaviest rain is most likely over high ground, where some places may see 60-80 millimetres
"Strong winds are also expected with 30-40 mph gusts likely around exposed coasts and hills."
