High winds and gusts of up to 70mph are set to batter Britain later today ahead of Storm Atiyah.
Coastal regions covering Wales, south-west England and north-wet England are expected to see large waves up to 40ft offshore, whereas Scotland's west coast will see 28ft waves.
Britons are warned to be aware of any loose items or structures as strong winds of between 50 to 60mph could knock over Christmas lights or inflatable decorations from buildings.
The two yellow wind warnings are in place from 3pm to 9am on both Sunday and Monday.
Met Office deputy chief meteorologist Tony Wardle told Mirror Online: "The UK is in for an unsettled period of weather with some very strong winds, especially along the west coast.
"Gusts of 50-60mph are expected quite widely inland, with up to 70mph gusts around some coastal locations.
"As well as strong winds there will be large coastal waves in the south-west, so bare this in mind before heading out in these regions.
"Monday will be a much-improved day with brighter and drier conditions moving in from the west before another period of wet and windy weather on Tuesday."
The Environmental Agency has issued 37 flood alerts and warnings, mostly rivers along Lake District National Park, Yorkshire Dales National Park and Dorset.
5-day weather forecast
Early rain clearing the far southeast, then all parts seeing sunny spells and blustery showers. Showers will be frequent and heavy in the west with hail, thunder and squally winds. Feeling rather cold.
Further showers, some heavy, moving southeastwards across many parts. Showers turning wintry over northern Scotland. Very windy, with severe gales around some coasts in the west and north.
Showers affecting coastal areas at first, wintry across northern Scotland. Otherwise, most parts dry with sunny spells. Feeling cold, though winds steadily easing.
Outlook for Tuesday to Thursday:
Remaining unsettled and often very windy, with periods of sometimes heavy rain interspersed with brighter, colder interludes and heavy showers, these wintry on hills in the north.