With a huge swell and big waves expected off Cornwall on Wednesday, the message from the RNLI is "do not go in the sea".
Low pressure and strong winds are predicted to create potentially dangerous conditions on Cornwall's beaches.
Steve Instance from the RNLI said: "Keep well away, stay well back.
"Over the the next couple of days it's still going to remain quite stormy, quite turbulent, so please look out for beaches where they've set up the flags.
"If you can see some flags that means there's a lifeguard service, if it's a red that means don't go in."