Heavy rain, strong winds and high tides could combine to cause localised flooding around Cornwall over the next three days.
Cornwall Council is asking residents to be prepared and take precautions where necessary after the warning was given by the Met Office.
Officers from Cornwall Council’s Highways, Environment, Fire and Rescue and Emergency Management services are monitoring the situation closely and are on standby to deal with any problems.
A council spokesman said: "During last month’s flooding a number of householders reported difficulties in obtaining sandbags when the severe weather affected their local area.
"As neither the Council nor the Environment Agency has a statutory duty to provide sandbags, anyone whose property is prone to flooding should ensure they have a supply of sandbags ready to protect their home or business should they need to.
"Local communities are also encouraged to check with vulnerable neighbours in case they need help with obtaining flood protection materials.
"Sandbags can be obtained from builders merchants, DIY and hardware stores. Anyone who is unsure if their property is at risk can check on the environment agency website www.environment-agency.gov.uk or call the floodline on 0845 988 1188.
"Anyone with responsibility for community Christmas lights and decorations should ensure they are properly secured against strong winds and consider turning off Christmas lights if the weather deteriorates.
"We would also advise checking for any damp or damage before turning them back on. Any problems should be dealt with by a qualified electrician."
For further advice on preparing for flooding visit the environment agency website www.environment-agency.gov.uk or the Cornwall Council website at www.cornwall.gov.uk/flooding