The Met Office has issued a yellow weather warning for heavy rain across many parts of Northern Ireland.
The warning is in force and valid until 22:00 BST on Tuesday.
Heavy thundery downpours are developing and causing isolated flooding, disrupting travel on roads in some areas.
The downpours will ease early on Tuesday night, with County Antrim last to see the rain clear.
Traffic at a standstill A5 between Derry and Strabane. Find another route... if you don't have 4x4 or tractor! pic.twitter.com/PE08RWqasz— Eve Blair (@blaireve) August 22, 2017
Not all areas are seeing heavy downpours with some places set to avoid the worst of the rain.
Met Éireann has issued weather warnings for thunder across the whole island. A heavy rain warning is also in force for Connaught, along with counties Monaghan, Cavan and Donegal.
There's some flooding on the road between Ballygawley and Omagh. Please reduce your speed and drive with extra care.— PSNI (@PoliceServiceNI) August 22, 2017
That was some clap of thunder and lightning! Malahide village in complete darkness! #poweroutage— Siobhan O'Connor (@leinster2009) August 22, 2017