Widespread travel disruption and flooding is predicted across the country as conditions deteriorate from Thursday into Friday morning, with a series of Met Office weather warnings already in force.
Donegal, Mayo, Sligo, Clare, Kerry, Dublin, Louth, Wexford, Wicklow, Meath, Cork and Waterford have also been issued with a status Orange warning for the Storm.
"The rain is expected to be accompanied by strong winds, which may increase autumnal leaf fall and potential for blocked drains/culverts, heightening the potential for flooding".
"We have issued orange warnings for the coastal counties, and yellow warnings for the inland counties".
Storm Callum has been upgraded from a yellow to an amber weather warning, which will cover a large part of Pembrokeshire, Carmarthenshire and Ceredigion on Friday, October 12 and Saturday, October 13. The main concern we are anxious about for the area is the amount of rainfall throughout Saturday itself.
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Winds will be strongest overnight and early on Friday, gusting between 90 and 110 km/h at coasts.
Officials said on Thursday morning that many schools could face closure on Friday, but that any decisions on school or business closures, as well as impacts to public transport systems, will not become fully apparent until tomorrow morning.
The Road Safety Authority (RSA) has urged drivers to exercise extreme caution over the coming days.
"There are a number of locations on our network which have been susceptible to flooding during extreme weather and as such we are looking at possible amendments to services in partnership with Network Rail to reduce the impact of this weather".
"It may only be mid-October but it appears nearly certain that Ireland is going to be hit by its third storm of the 2018/2019 winter season and it's vital that we all take a look at our own road behaviour and adapt it accordingly to minimise incidents during this weather", Conor Faughnan, AA Director of Consumer Affairs stated.
Last month, Storm Ali battered the country, causing two deaths and widespread infrastructural damage.