A thunderstorm warning has been issued for Derry and across the North of Ireland from lunchtime on Monday, June 19.
The Met Office has warned that up to 20mm of rain could fall in some places across the North in under an hour.
It said that up to 25mm could fall in a few spots in the same time, leading to some surface flooding.
The rain could possibly cause some homes and businesses to flood, while lightning strikes could also become an additional hazard.
The warning lasts from 1 pm until 8 pm on Monday.
Driving conditions could be affected by heavy downpours, surface flooding and hail.
Meanwhile, warnings have also been issued across much of the Republic.
Met Éireann is warning of possible flooding, poor visibility, difficult driving conditions and power outages.
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