A more severe orange warning has been issued in the Republic of Ireland for Thursday and Friday as the country expect gale-force winds of up to 80mph.
As well as this, Dublin, Louth, Wexford, Wicklow, Meath and Waterford also have an orange winding warning which says Storm Callum will bring South to southeast winds of between 100 and 130 km/h, strongest at the coast.
"Some exposed locations could see as much as four inches by the end of Friday".
Strong winds at this time of year can increase the rate of leaf fall which can potentially block drains or culverts and, with the heavy rainfall expected over Friday and Saturday, could well heighten the potential for flooding.
Richard Brown, Pembrokeshire County Council's Head of Environmental Services and Public Protection, said that although Council staff would be working continuously to clear the roads, motorists would need to be vigilant.
He also urged extra care along the Pembrokeshire coastline.
Meanwhile high tide is due to occur at 7.45am tomorrow, and is expected to coincide with storm surges and low atmospheric pressure, leading to concerns of flooding in the area of Galway Harbour, Spanish Parade, and the Fishmarket.
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Limerick City and County Council has crews on standby to deal with any serious issues as a result from Storm Callum. Originally, the warning for these counties was to be observed from 11pm Thursday night until 1pm on Friday.
From midnight on Saturday, weather experts have warned of yet more "heavy and persistent" rainfall across the city.
The National Emergency Coordination Group is meeting today to prepare for the arrival of Storm Callum. "There could be localised flooding issues".
Wales and the North West could have the heaviest deluge.
People should take action now to be prepared.
While heavy rain is expected to continue into the Saturday, the wind is now believed to ease off by Friday evening.