Cllr John Campbell says areas of South Donegal which have been prone to flooding in the past owing to high tides could still be vulnerable.
Heavy and persistent rain is due to fall from 6am until midnight on Friday in the north west of England, south west of Scotland and Lothian Borders, Wales and Yorkshire and Humber.
The UK Met Office now has a yellow wind warning for Friday and rain warning into Saturday.
THE Met Office has upgraded its weather warning for later this week, predicting that an incoming storm could bring deep flood water. 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.
"We're likely to see the effects of Storm Callum coming in from Friday morning". Localised coastal/tidal flooding is probable on Friday along the south Wales coast and is also possible for west Wales, the Wye estuary, and some north-west and south-west coasts of England. Expect the unexpected. Watch out for falling/fallen debris on the road and vehicles veering across the road.
Arriva Trains Wales is planning to shut the line between 7am and 11am on Friday morning and in the evening.
While heavy rain is expected to continue into Saturday, the wind is now forecast to ease off by Friday evening.
"We would urge drivers to take care in wet conditions".
Ms Donnelly said there would be a risk of flooding in places.