"The strongest winds associated with this event will occur during the night-time hours and Friday morning rush-hour commute".
The UK Met Office now has a yellow wind warning for Friday and rain warning into Saturday. "Road users should also be aware of the risk of their vehicles aquaplaning on standing water".
NRW has also advised people to take extra care will driving, to avoid walking or driving through any flood water, and to avoid fast flowing rivers and streams.
Met Éireann has warned that strong winds associated with Storm Callum could reach speeds of between 110 and 130km/h.
"On Friday, the winds will ease somewhat in many areas during the morning, becoming fresh or strong southerly".
Winds of 50mph will batter Northern Ireland, southwest England and west Wales during Thursday night, spreading to Scotland by Friday morning. On Saturday the rain could become even heavier.
Yellow weather warnings are in place for the rest of Wales and large parts of northern England and southern Scotland. And another for Saturday which covers more of Scotland. "In addition, leaves and twigs, brought down by the wind, could block drains and culverts, increasing the likelihood of flooding".
Storm Callum is set to hit the United Kingdom later this week, bringing heavy rain and gale-force winds up to 80mph, as the Met Office says there is a danger to life.
Storm Callum, which was named on Wednesday, will also bring with it a downpour of rain on Saturday - which could cause flooding across the local area.
The extreme conditions triggered two yellow - "be aware" - warnings from the Met Office after a similar alert on Tuesday caused flooding and travel disruption to roads, railways and ferries.
Coats on the south and west of the country are expected to be the worst affected by the storm, worth risks of heavy flooding and structural damage.
In Galway, council crews are rolling out the city's aquadam ahead of potential high-tides of up to six metres. "There could be localised flooding issues".