Met Éireann has issued an immediate thunderstorm weather warning for eight counties.
The forecaster has placed Cavan, Donegal, Monaghan, Leitrim, Longford, Louth, Meath, Westmeath on a status yellow thunderstorm alert.
The warning took immediate effect shortly before 3pm, and will remain in force until 8pm this evening.
The forecaster has advised that a risk of scattered thunderstorms could lead to spot flooding in these locations.
Some thunderstorms have developed across parts of Ulster, north Leinster and east Connaught this afternoon. See the locations of these heavy showers on latest radar imagery below. Lightning reports are "crosses". ⛈️
More here 👇https://t.co/Xg3aMJlyuShttps://t.co/9gKN6SVok4 pic.twitter.com/EnIoEsY8CX
— Met Éireann (@MetEireann) July 4, 2021
In Northern Ireland, the UK Met Office has meanwhile issued a thunderstorm warning for all six counties of the region.
From 10am this morning, Antrim, Armagh, Down, Fermanagh, Tyrone and Derry have been under the yellow grade warning.
Heavy showers and thunderstorms could lead to a chance of flooding and disruption, the forecaster said.
The warning remains in place until midnight tonight.
