Hail, thunder, 130km/h winds and flooding are all in the forecast as Storm Ciara batters Ireland - and Met Eireann have warned snow is on the way.
The earliest snowfall could hit tonight as temperatures fall close to freezing in many parts of the country.
A Status Orange weather warning is in force for the entire country from 5am this morning, and will remain in place until 12 noon.
It reads: "On Sunday, Storm Ciara will produce very strong southwest winds with mean speeds of 65 to 80km/h and gusts generally up to 130km/h.
"A combination of Spring Tides and high seas as well as stormy conditions will result in a significant risk of coastal flooding especially along western and northwestern coasts."
Experts are also predicting some hail and even thunder today as Storm Ciara makes landfall.
And we could see snow tonight in some areas, particularly on higher ground.
A Met Eireann forecaster said: "Extremely windy or stormy today with heavy thundery rain giving way to sunny spells and frequent squally showers, some of hail and thunder.
"The winds at their strongest in the morning and early afternoon with some severe and damaging gusts. Some localised flooding also. Highest temperatures 9 to 11 degrees.
"Windy this evening and tonight with stormy conditions returning to some Atlantic coasts. Much colder with showers turning wintry and giving falls of sleet and snow.
"Some snow lying by morning especially over hills in the North and West. Overnight lows of 1 to 3 degrees."
More strong winds, and more snow, are also expected tomorrow, and the heaviest snowfall is likely on Monday and Tuesday.
A forecaster added: "Tomorrow will be bitterly cold and very windy again with a significant wind chill factor and the likelihood of stormy conditions along Western and Northern coastal areas.
"Very showery too, wintry at times, with hail, sleet and snow but sunny spells also. Highs of only 4 to 6 degrees.
"Very cold and very windy on Monday night with strong to gale force West to Northwest winds, severe winds possible near Western and Northern coasts.
"Further hail, sleet and snow showers feeding in with further accumulations of snow in parts and icy patches. Lows around freezing.
"Tuesday will be a bitterly cold day and still very windy with a significant wind chill factor. Very showery too, still wintry at times, with hail, sleet and snow.
"Westerly winds will be fresh to strong and gusty, with gales in western and northern coastal areas. Highs of only 3 to 7 degrees.
"Winds moderating overnight with some frost and ice developing too, and overnight lows of -1 to 2 degrees."
