A yellow warning for a thunderstorm has been put in place for Northern Ireland.
It is in place from midnight tonight through to 7am tomorrow (Monday).
The Met Office said a band of heavy, thundery rain is expected to push quickly east across Northern Ireland.
As the heavy rain moves through, 20-40 mm could fall in an hour or so, with a few places perhaps seeing 60 mm by the time rain clears.
They warned to expect the chance of spray and sudden flooding which could lead to difficult driving conditions and some road closures.
There is a slight chance that power cuts could occur and delays or cancellations to public transport if flooding or lightning strikes occur.
The Met Office also warns the chance of quick flooding with damage to some buildings from floodwater, lightning strikes, hail or strong winds
There is a small chance of fast flowing or deep floodwater causing danger to life.
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What should I do?
Consider if your location is at risk of flash flooding. If so, consider preparing a flood plan and an emergency flood kit.
Prepare to protect your property and people from injury. Before gusty winds arrive, check to ensure moveable objects or temporary structures are well secured. Items include; bins, garden furniture, trampolines, tents, gazebos, sheds, and fences.
Give yourself the best chance of avoiding delays by checking road conditions if driving, or bus and train timetables, amending your travel plans if necessary.
People cope better with power cuts when they have prepared for them in advance. Consider gathering torches and batteries, a mobile phone power pack and other essential items.
If you find yourself outside and hear thunder, protect yourself by finding a safe enclosed shelter (such as a car). Do not shelter under or near trees, or other structures which may be struck by lightning. If you are on an elevated area move to lower ground.
Be prepared for weather warnings to change quickly: when a weather warning is issued, the Met Office recommends staying up to date with the weather forecast in your area.
Watch: Moment Co Tyrone woman catches lightning strike on camera as thunderstorms continue across NI