There could be 50mm to 60mm of rainfall over higher ground in Cumbria and "severe gales" in the northwest.
Police teams have issued travel warnings and advice with Storm Gareth bringing treacherous and risky driving conditions in Calderdale. There is also the risk of coastal flooding due to high seas, the office has warned.
The yellow warning for the rest of Ireland warns of sustained winds reaching 65km/hr and gusts of up to 110km/hr during Storm Gareth.
Winds are expected to reach 55mph inland and 65mph along western coasts, with heavy rain also forecast. The wind and showers will gradually ease as the day progresses, ahead of more prolonged evening rain. The Traffic Scotland mobile website allows you to get information on the move and the Traffic Scotland twitter page is updated regularly.
Buses and train services are likely to take longer and there could be some short term power issues.
On Saturday rain and hill snow will begin to clear and give way to heavy showers.
The outlook for Wednesday to Friday in the East Midlands reads: "Often windy, particularly on Wednesday, and often feeling cold due to the strength of the wind".