Official warnings will be issued in line with those forecasts, Ms Lowe added.
The third storm of the 18/19 season is set to bring heavy downpours and strong gales to the country, with yellow weather warnings now in place in some areas.
While the strongest winds will have passed by Friday noon, Ms Dillon said it would continue to be windy right through Friday and into Saturday and be accompanied by heavy rain.
The Met Office warned homes and businesses could be subjected to flooding, while there's a chance of power cuts and loss of services.
On Saturday, areas over high ground could see a further 50 to 80mm of rain.
Pembrokeshire County Council is also warning residents to be aware of the potential for danger and disruption. Gusts 50 to 60 miles per hour are likely in some places, with potential for gusts of 70 to 80 miles per hour around exposed coasts and hills.
The Met Office said there will be strong winds and rainfall up to 10cm, leading to possible flooding and hard driving conditions. Fallen leaves will lead to blocked drains and flooding issues.
"We would urge drivers to take care in wet conditions". There will also be spells of heavy rain, high tides and coastal flooding. Bridges and more exposed road routes will also be affected.
Forecasters predict Storm Callum will bring over month's worth of rainfall, with a risk of storm surges along coastlines.
It is because the storm is likely to coincide with high tides around the south Wales coast. It means southern parts of Wales especially are at risk of being flooded.
Here an Amber Warning is in place all day.
"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".
"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".