Environment Agency officers are on the ground ensuring defences are in good working order, monitoring sea levels and wind directions.
Flying debris could lead to injuries or danger to life, while some damage to buildings is likely, it has said.
"There is a small chance of transport delays, route and bridge closures, and cancellations to public transport".
There'll be further rain and showers on Thursday and strong northwest winds will develop in the second half of the day. Some western coastal areas could see gusts of 80mph. This indicates that flooding is expected, and that "immediate action" is required. They will continue to monitor the situation and issue Flood Alerts should the need arise. Properties may flood and there may be travel disruption.
"The unsettled theme continues throughout this week, with further spells of rain moving across the United Kingdom from the west as many return to work on Tuesday, and there will again be some snow over the high ground in Scotland", said Paul Gundersen, the Met Office's chief forecaster.
There will be very high seas along Atlantic coasts, with a risk of coastal flooding also.
Tidal spray and onshore flooding may occur to roads and some properties along the coast may be affected.