A yellow thunderstorm warning has been issued by the Met Office for parts of Northern Ireland on Tuesday, 4 August 2026. The warning is active from 12:00 to 21:00, with a possibility of up to 30mm of rain in one to two hours, strong winds, and hail.
Areas experiencing heavy downpours are at risk of flash flooding due to the dry ground struggling to absorb rainfall. Hail may accompany the most intense downpours.
The heatwave affecting parts of the UK is set to continue into Tuesday, with more areas in southern and eastern England expected to reach heatwave criteria. Pershore in Worcestershire and Cavendish in Suffolk have already met the heatwave threshold for three consecutive days as of Monday.
Amber and yellow heat health alerts are in effect across much of England until 09:00 BST on Wednesday, with temperatures potentially exceeding 30C in some regions. However, a change in the weather pattern is anticipated from midweek, bringing cooler temperatures.
A cold front will move southwards across the Midlands and into south-east England during Tuesday, but it is unlikely to bring significant rainfall. Some areas in the far south-east, including London, Essex, Kent, and Surrey, may not receive any rain at all.
Forecast models suggest that August is likely to bring continued low rainfall and above-average temperatures for much of the UK. Further spikes of heat are possible, though the likelihood of extreme temperatures in the high 30s may lessen as August progresses.