Gale force winds and high tides are expected to bring tidal surges into low lying areas across the Isle of Man at lunchtime today.
A severe flood warning has been issued by the Department of Infrastructure and police are warning members of the public not to put themselves in danger by trying to witness the extreme weather event.
Coastal roads and proms will be closed ahead of the high tide.
Emergency services are warning that the heavy seas may also cause some structural damage.The DOI has called in around 50 staff from leave to help manage the incident and Civil Defence is on standby.
A DOI spokesman said: 'The high tide will combine with a storm surge to bring flooding in excess of that witnessed in 2002. Water levels are expected to be up to 800 millimetres above the point where the harbour areas start to flood.'
In 2002 an estimated £8million of damage was caused. Property owners are being warned to take steps to protect their own property and to move vehicles out of the low lying areas.
Cars should be removed from promenades. Sandbags are being issued.
The spokesman said: 'We will not be able to stop the flooding from this 1 in 50 year event.'
Rough seas will bring additional danger, with waves of over four metres expected at the height of the storm. Steam Packet boats have been cancelled.
For general help and support members of the public should call the DOI on 850000.
The following roads will be closed from 11am: Douglas prom Broadway to Port Jack, Leigh Terrace in Douglas, Shore Road in Gansey, Castletown prom, Ramsey prom, Parliament Street in Ramsey, North Quay in Douglas, Laxey prom.
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