The Irish government is monitoring the situation, a spokesman said in an emailed statement. It will decide later Friday whether to convene a taskforce to co-ordinate its response to the storm.

Ophelia will move across the country very quickly and may bring heavy rain, if it makes landfall, Gerald Fleming, head of forecasting at the Irish weather service, said on RTE radio Friday. The storm could pummel the Cork and Kerry coast but it's still three or four days away.

Damages could reach $800M in Ireland

Using the current forecast track from the National Hurricane Center, damages could reach $800 million in Ireland and $300 million in the U.K., as well as tens of millions in France, Spain and Portugal, according to Chuck Watson, a disaster modeler at Enki Research in Savannah, Georgia. Using European forecasts, those numbers could be cut in half.

Related: 'Extremely active' hurricane season is 3rd worst on record

“My subjective guesstimate is more like $600 million in Ireland and under $100 million for the U.K.,” Watson said. Debbie's damages would've reached $338 million in today's dollars.

Ireland's Met Eireann weather office and the Met Office in the U.K. issued yellow warnings for Monday, meaning residents need to be aware of encroaching risks.

“Power cuts may occur, with the potential to affect other services, such as mobile phone coverage,” the Met Office said in its warning. “Some damage to buildings, such as tiles blown from roofs could happen, perhaps leading to injuries and danger to life from flying debris.”

Unusual hurricane path

It's unusual for a hurricane to head toward northwest Europe. The Atlantic hurricane season, usually a bigger threat to the U.S., Mexico and Caribbean, has produced 15 named storms, including 10 consecutive hurricanes — the most since the late 19th century. The storms have killed hundreds and caused an estimated $300 billion in damage across Central America, the Caribbean and the U.S.

Other important items to know about Ophelia

• Two well-known computer forecast models were split Thursday on whether Ophelia would strike the southwest of Ireland near counties Kerry and Cork, said Bob Henson, a meteorologist at Weather Underground in Boulder, Colorado.
• The U.S. Global Forecast System keeps the hurricane offshore, while the European Centre for Medium Range Weather Forecasts model takes it into Ireland sometime Monday.
• As the storm approaches, the U.K. is forecast to see a weekend of unseasonably warm weather, thanks to the movement of warm, tropical air. Temperatures could be “in the low 20s” Celsius, according to Reynolds. That's about 72 Fahrenheit.
• The U.S. has been struck by six storms, four of which were hurricanes. Europe got a taste of the stormy conditions earlier this month when the remnants of hurricanes Maria and Lee helped push U.K. wind power generation toward a record.
• Winds from Ophelia may also boost wind production. U.K. wind generation is forecast at 8,902 megawatts on Oct. 17, almost touching Oct. 1's record.
• Wind farms may be turned off if winds reach 85 miles per hours, according to Stephen Lilley, partner at Greencoat Capital LLP, which manages funds that invest in wind farms including four in Northern Ireland.

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