An amber weather warning for heavy rain, severe gales and coastal overtopping will be in force tomorrow.
The conditions are expected to affect the Island from 3am to 3pm.
The Ronaldsway Met Office says heavy rain overnight means a risk of localised flooding.
It adds that Storm Debi will bring storm force winds tomorrow morning, with gusts of 60-70mph, or possibly up to 80mph.
Finally, large waves are expected to result in coastal overtopping at high tide, around 11am, leaving debris.
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