Met Eireann has upgraded its weather warning for Kerry for Friday morning, to Status Red.
This means Storm Éowyn may pose a danger to life.
The neighbouring counties of Clare, Cork and Limerick are also under Status Red.
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The public is being warned of extremely dangerous traveling conditions, unsafe working conditions, widespread power outages, structural damage and wave overtopping.
The red warning comes into effect at 3 am on Friday morning, lasting until 10am.
The rest of the country will be under an orange alert from 2 am until 5 pm on Friday.
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Gusts of 130 kilometres per hour, and higher, can be expected.
