Hundreds of homes have been left without power as heavy rain and winds hit the north.
More than 200 people have been left without electricity amid gusts of up to 60mph.
A Met Office weather warning has been in place since 9am.
The forecaster has warned of possible flooding in some areas.
There are also reports of fallen trees blocking roads in Co Antrim.
Lashing rain and strong winds make for difficult driving conditions this morning. Please leave extra time for your journey, slow down and keep a safe distance between you and the vehicle in front of you. #keepingpeoplesafe
— PSNI (@PoliceServiceNI) December 18, 2018