A status orange wind warning has been issued for three counties as Storm Erik approaches the country.
An Orange wind warning is now valid for Galway, Mayo and Donegal with the forecaster warning of "damaging" gusts.
Worst of the weather will be felt in Galway, Mayo and Donegal where Ms Donnelly said flooding is likely.
Wet weather will follow later as rain moves in across the United Kingdom, and some of it could be heavy at times.
A yellow weather warning is in place for the rest of Ireland but will last only an hour, expiring at 6am on Friday.
Rescue services are also warning that seas are still high and will take some time to settle.
These conditions will include potentially hazardous gusts along "exposed coastal areas" through tomorrow morning and early afternoon, as well as the added threat of coastal flooding.
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Storm Erik has arrived, then, and he's not messing about.
Met Éireann website forecast issued Issued at 7.28pm on February 7.
Storm Erik caused significant disruption to CalMac's west coast ferries yesterday, with sailings on many routes suspended, such as the main link to Arran.
'Meanwhile, in the north it's going to be a fairly bright day. Afternoon highs of 7 to 10 degrees.
The north is expected to bear the brunt of the high winds, with "severe" gusts expected this morning.
Much of the country will see strong winds and rain showers, some mixed with hale and becoming thundery, meteorologist Alex Burkill said. Highest temperatures will be around 6C to 9C. Minima of 1 to 4 degrees Celsius. Sunday night will be cold with a sharp frost and icy patches developing.