The RNLI is urging people to stay away from exposed coastal areas as Storm Austen threatens to bring damaging winds and heavy rain to Newquay and Cornwall in the early hours of Friday.
The Met Office has issued an amber weather warning, with gusts of more than 70mph forecast in some areas.
Kernow Weather Team says exposed parts of the Newquay coastline could experience winds reaching 80mph.
The lifesaving charity is warning that conditions could become extremely dangerous along beaches, cliffs and seafronts, with powerful waves posing a serious risk to anyone venturing too close to the water.
Some RNLI lifeguarded beaches across the South West will remain operational during the October half-term holiday, although lifeguards may fly red flags if conditions are considered too dangerous for entering the water.
Beaches without lifeguard cover are expected to be particularly hazardous, with visitors urged to keep well back from the water's edge.
RNLI Water Safety Manager Ross Macleod said: "Storm Austen is set to bring potentially dangerous conditions so we're asking the public to stay vigilant and not take unnecessary risks.
"If you plan to visit the coast or a waterside location, we urge you stay a safe distance from the water as conditions could knock you off your feet or wash you into the sea."
He also urged people not to enter the water to rescue someone else, warning that they could end up in serious difficulty themselves.
RNLI advice if you get into trouble in the water
The charity is reminding people to remember its Float to Live advice:
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Tilt your head back with your ears submerged.
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Relax and try to breathe normally.
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Move your hands and legs to help you stay afloat.
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Don't worry if your legs sink, as everyone floats differently.
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Once your breathing is under control, call for help or swim to safety.
What to do if you see someone in difficulty
The RNLI says people should remember "Phone, Float, Throw":
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Phone 999 or 112 and ask for the Coastguard.
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Encourage the person in difficulty to float on their back.
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Throw them something buoyant, such as a life ring.
The charity is urging people not to put themselves at risk by entering the water to attempt a rescue.
The strongest winds from Storm Austen are expected during Friday morning, with people advised to follow the latest weather warnings and avoid unnecessary visits to exposed coastal locations.
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