Weather Warning: Code Level Orange, Storm Eleanor will quickly move across the country this evening and early tonight.
High tide in Blackpool will be at around 11.30am.
Forecasters also say there is a "danger to life" from beach material being thrown up onto the coast.
"As well as this, there is a small chance of disruption to power and other services".
The Met Office has warned of "very strong winds" arriving this evening and continuing overnight.
She added: "The strong winds coincide with high tides in some western areas which could lead to large waves which could have some impact as well".
The warning predicts 60 to 70mph gales, while the western coastal areas could experience gusts hitting 80mph. They will continue to monitor the situation and issue Flood Alerts should the need arise. This indicates that flooding is expected, and that "immediate action" is required.
"If you have to travel, check your route before setting off and please do not walk or drive through flood water - just 30cm can move a vehicle".
"Local coastal flooding is probable for parts of the Bristol Channel coast during Tuesday, extending to parts of the north coasts of Devon and Cornwall during Wednesday and Thursday".
There will be very high seas along Atlantic coasts, with a risk of coastal flooding also.