The effects of Storm Callum are expected from 10 tonight - when the orange weather warning kicks in for counties Cork and Kerry.
Storm Callum is now experiencing what is know in the world of meteorology as "bombogenesis", where by a system deepens by more than 24hPa inside a 24hr period.
The warnings are set to remain in place until 9 o' clock tomorrow morning for most of the country.
Rainfall is expected to reach up to 10cm and could cause flooding, as well as making driving conditions hard for those affected.
The orange warning for Meath is in place from midnight tonight until 9am tomorrow morning.
Heavy rainfall could present a risk to life, the Met Office said, as it issued a 36-hour amber warning for Wales. There is the risk of localised flooding, tricky conditions on the roads with surface water and spray.
"Natural Resources Wales has issued flood alerts for the Pembrokeshire coast due to a low pressure system bringing tidal surges, strong winds and large waves on top of high astronomical tide period" he continued. Expect the unexpected. Watch out for falling/fallen debris on the road and vehicles veering across the road.
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The warning for those counties is in place from Friday 12 October 2018 00:01 to Friday 12 October 2018 09:00.
Callum is the third named storm of the 2018/19 season, following Ali and Bronagh which both camer in September.
"Widespread flooding from surface water and rivers is possible across south Wales on Friday and Saturday, and is possible but not now expected elsewhere in Wales and parts of north-west England".
The National Emergency Coordination Group is meeting today to prepare for the arrival of Storm Callum.
"We are advising people to avoid coastal areas during this event".
Winds will be strongest overnight and early on Friday, gusting between 110 and 130 km/h (80mph) at coasts.
Director Stephen Stewart said: "Even though power cuts are rare, during times of heavy rain and flooding they become more likely".