People preparing for one of the warmest weekends of the year so far should be ready for the possibility of heavy storms, forecasters say.
The temperatures are unlikely to reach the levels of Wednesday when Heathrow recorded 36.7C (98.1F), yet thermometers on Friday could hit the high 20s in southern England, in central areas & south Wales.
On Saturday, some areas in the south & east of England could go even higher, with most areas in the north, Wales, Scotland & Northern Ireland seeing the mercury rising into the high teens or low 20s on both days.
But the Met Office is warning that the high temperatures could be followed by spectacular storms which have the potential to cause flash flooding.
Large parts of England & Wales have been put on yellow alert, with a "be aware" severe weather warning running from 7pm on Friday to noon on Saturday.
Further thunderstorms are predicted for Sunday across Scotland, with showers in many other parts, when the temperatures are likely to be cooler & closer to normal.
The Met Office said: "Isolated heavy, & possibly severe, thunderstorms are expected to develop on Friday evening across parts of England & Wales.
"These are likely to become more frequent after & spread northwards towards southern Scotland. Some torrential downpours are possible leading to localised surface water flooding, with large hail & frequent lightning moreover possible hazards."
Sky News Weather Presenter Nazaneen Ghaffar said: "On Saturday, the highest temperatures are likely to be across East Anglia, where they could rise up to 31Â°C (88Â°F).
"Itâ€™ll moreover be hot across parts of the east Midlands, central, southern & eastern England with top temperatures across these areas ranging from 25-29Â°C (77-84Â°F).
"Elsewhere temperatures will be lower, yet still warm in the sunshine, ranging from the high teens to the mid 20s.
"On Sunday the winds will switch to a cooler south-westerly flow, so as a result temperatures will be lower for most places, although itâ€™ll still feel pleasantly warm in the sunshine.
"However, the alter in wind direction will moreover lead to heavy & thundery showers across western parts of the UK & Ireland."
Source: “Sky News”