Met Eireann issued two weather warnings on Wednesday amid fears the fourth storm in a fortnight could blast Ireland this week.
Storm Gladys has the potential to bring downpours and strong winds if it is named by the national forecaster.
The potential storm would follow Storms Dudley, Eunice and Franklin which already caused fallen trees, blocked roads, power outages and damage nationwide.
It comes as a snow and ice warning for the entire country will be in effect from 10pm on Wednesday until 12pm on Thursday.
The status yellow alert says: "Blustery squally showers of hail, sleet and snow with icy stretches on untreated surfaces will lead to hazardous driving conditions on Wednesday night and Thursday morning. Some thunder and lightning expected too."
A status yellow warning will also be in place for six counties from 8am until 6pm on Thursday.
The alert for Clare, Donegal, Galway, Leitrim, Mayo and Sligo says that "very strong and gusty west to northwest winds" can be expected.
Met Eireann's national forecast says that Wednesday night will become cold with any remaining rain clearing to the southeast early on.
A forecaster said: "Showers of rain, sleet and snow in the northwest will spread across the country overnight with the chance of isolated thunderstorms and hail also. Lowest temperatures of -2 to +1 degrees with frost and ice developing.
"Cold to start tomorrow with scattered blustery showers of sleet, snow and hail and icy stretches also, leading to treacherous conditions in parts. There will be potential for isolated thunderstorms too.
"Showers of rain, sleet and hail will continue through the afternoon, with snow on high ground. Windy with strong to near gale force and gusty westerly winds, and the potential for stormy conditions near the north and northwest coast for a time in the afternoon. Highest temperatures of just 4 to 7 degrees with an added wind chill factor.
"Feeling raw in rather brisk northwest winds with some further scattered wintry showers [on Thursday night], mainly confined to western and northern coasts overnight. Long clear spells will develop elsewhere. Lowest temperatures of 0 to 4 degrees with frost and possible ice developing later, that's as the winds ease.
"Mostly dry with good sunny spells [on Friday] and just light southwest breezes. During the afternoon however, cloud will build across much of the western half of the country as winds freshen on western coasts. The odd spot of drizzle is possible in Atlantic fringes later. Highest temperatures will range 8 to 10 degrees."
They continued for Friday night: "Little change overnight, though southerly winds will freshen towards morning, with strong winds developing on western coasts. Lowest temperatures of 2 to 7 degrees, coolest across eastern counties.
"Mostly cloudy and breezy [on Saturday] with patchy drizzle across southern and western counties. Windy in coastal areas with winds strong there. Highest temperatures of 8 to 10 degrees in fresh and gusty southerly winds.
"Rain is expected to move in across the country during Saturday night, turning heavy at times, accompanied by fresh to strong southerly winds. A clearance will develop across Atlantic counties later. Lowest temperatures of 2 to 7 degrees, coolest across western counties.
"The last of the overnight rain is likely to clear early on Sunday, leaving a mostly dry day with sunny spells and just light south to southwest breezes. Highest temperatures of 7 to 10 degrees."
