Emergency alerts, which means sounds blare from mobile phones, have been issued to people in the areas most at risk from Storm Goretti.
A Cabinet Office spokesman said: “The Met Office has issued a red warning for the Isles of Scilly and Cornwall from 4pm until 11pm on Thursday January 8.
“In light of the damaging winds and associated disruption, the Cabinet Office is issuing two Emergency Alerts to people in affected areas.
“The first was sent at approximately 3pm on Thursday January 8 to people in the Isles of Scilly. The second will be sent at approximately 5pm on Thursday January 8 to people in Cornwall.
“The Emergency Alert system will send a message to every compatible mobile phone in the impacted areas, containing information about the red warning and guidance on how to stay safe.
“Compatible mobile phones will make a loud siren-like sound even if they are set on silent. The sound and vibration will last for about 10 seconds.
It is the fifth time alerts have been used in this way.
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