"Outbreaks of rain, some of it heavy, will accompany the strong winds and will add to the hard driving conditions".
People are urged to take extra care when traveling.
"Winds will gradually ease from the west during the night, finally easing from the far south east of England around dawn on Thursday", the forecaster said.
"Two to five centimetres is likely for many parts with 10 to 20 cm [eight inches] possible in places, mainly over higher ground". The impact of the heavy rain will be worsened by strong winds across many parts of the warning area. Bus and train services will also probably be affected with journey times taking longer.
Hariri returns to Lebanon amid political crisis
The Saudi-owned, pan-Arab daily Asharq Al-Awsat alluded to French and Egyptian efforts in a front-page report on Tuesday. Mr Hariri stopped off briefly in Egypt and Cyprus on his way back to Beirut on Tuesday.
It has forecast that snow showers will be "heavy and persistent" for a time in the morning, before easing during the afternoon.
"Over southern coastal areas and high ground gusts of 70 miles per hour are possible, particularly over the mountains of Wales and Moors of southwest England on Wednesday morning and afternoon and then around coastal areas of the southeast of England overnight into Thursday".
The average November rainfall for all of England is 3.5in (90mm), rising to 5.5in (140mm) for the North West.
The temperature in Derry is also expected to drop considerably as we move towards the end of the week.