A yellow warning for wind is in place for Northern Ireland from 3am on Friday morning until just before midnight on Friday night.
The storm is set to blow in from the Atlantic and will hit the United Kingdom just hours before Princess Eugenie and Jack Brooksbank tie the knot at Windsor Castle on Friday morning.
Image - Met Office impact matrix for Friday's wind warning.as event become more likely, could rise to an Amber warning.
This intense area of low-pressure, will pass to the west of Ireland, northern England and Scotland during Friday.
"Winds will be strongest overnight and early on Friday, gusting between 90 and 110 km/h at coasts".
It will come into effect on Thursday, October 11 at 11pm and last until 9am the following morning.
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The Met Office said there will be strong winds and rainfall up to 10cm, leading to possible flooding and hard driving conditions.
For a time it'll be dry and clear, however, before dawn Storm Callum will bring a more persistent spell of wet and windy weather. "In addition, leaves and twigs, brought down by the wind, could block drains and culverts, increasing the likelihood of flooding".
"Severe winds" and flooding is expected later today with Storm Callum set to hit Ireland. The focus of heaviest rainfall will remain across Wales, and move increasingly into parts of Scotland.
Some CalMac ferry sailings were disrupted or cancelled because of the weather, including services from Mallaig and Armadale. It means southern parts of Wales especially are at risk of being flooded. Properties may flood and there is likely to be travel disruption. There is the potential for flooding in these areas.
While it appears that the west and north west may experience the worst of the storm, motorists nationwide are advised that driving conditions could worsen significantly across the next 48 hours.
Keep an eye on the rainfall live, using Netweather Radar.