The Met Office has issued an updated weather warning for thunderstorms, which are set to hit most of Northern Ireland over the coming days.
A yellow warning is now in place from 9am on Sunday, August 14 through to midnight. It had initially been in place from midday on Sunday to 6am on Monday, August 15.
A separate alert has also been issued for Monday.
Read more: Yellow weather warning for thunderstorms issued across NI
The weather warning comes after days of unbroken sunshine across the region.
The Met Office had already officially declared heatwave conditions in Ulster, as temperatures have exceeded more than 25C for three days in a row.
Now the fine weather is set to be replaced by large amounts of rain and the risk of flash flooding.
While some parts of NI will stay dry, hit-and-miss thunderstorms will develop on Sunday, potentially bringing disruption in places, forecasters say.
Up to 50mm of rain could fall in a few hours, while hail and lightning are also possible.
The warning is in place for all six Northern Ireland counties and parts of Scotland.
A Met Office spokesperson said: “During Sunday, cloudier conditions and areas of rain are expected to develop across parts of Northern Ireland and Scotland.
“Some places missing the worst, while others seem likely to see heavy downpours and thunderstorms.
“These could bring up to around 50 mm of rain falling in 2-3 hours, leading to some disruption, although there will be some drier periods in between.
“Hail and frequent lightning are potential additional hazards.”
On Monday, the Met Office warned that thunderstorms are likely to develop, bringing locally heavy rain and possible disruption. The alert is in place until midnight.
They added: “Whilst some places will avoid them, thunderstorms and areas of heavy rain are likely to continue to affect various areas of Northern Ireland and Scotland overnight and at times through Monday.
"The thunderstorms may begin to ease across western and northern areas later. 20-30 mm of rain could fall within an hour in a few places, and up to around 50 mm in three to six hours.
"Hail and frequent lightning are also possible hazards.”
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