UK & World News
'Intense Downpours' On Hottest Day Of Year
Parts of eastern England have experienced "intense downpours" with up to 20mm (0.8ins) of rain falling in an hour, the Met Office has told Sky News.
The most severe weather was in Nottinghamshire, where there were reports of large hail and flash floods.
Between 1pm and 2pm on Monday, 17.6mm (0.69in) of rain fell around the Nottingham area, while there was 20.2mm (0.79in) in Gringley, in the same county.
Lincolnshire was also reportedly hit by flash flooding.
Forecasters had earlier issued a yellow severe weather alert, warning people in several regions to "be aware" of heavy rain on Tuesday.
The areas were northeast England, Yorkshire and Humberside, the Midlands, east of England, London and the South East, and Northern Ireland.
Meteorologist Krista Mitchell said there had been some "pretty intense downpours" but the weather was "not extreme" for this time of year.
She said the heavy rainfall in a short period was due to "warm humid air from the continent" and "its energy being released in thunderstorms".
She told Sky it was also the hottest day of the year in the UK so far.
The mercury measured 26.5C (79.7F) in Writtle, Essex, beating 2014's previous high of 26.3C (79.3F) recorded in Heathrow on May 19.
The weather is predicted to become more settled this week.
Sky's weather presenter Jo Wheeler said: "Central and eastern areas should have a bright start to Tuesday morning.
"Despite the sunshine there, it'll be a cooler day, with temperatures reaching 22C, 72F, and it'll feel less humid.
"Showers over western areas will become more widespread through the day, but they should be well scattered. Later, it'll become breezy in the South West."
The heavy rain came after much of the UK was hit by torrential downpours and lightning strikes on Saturday, with up to 3cm (1.2in) of rain falling in just one hour.
High pressure from the South on Wednesday should improve the conditions.
Last month the Shard in London - western Europe's tallest building - was struck by lightning during a thunderstorm.
A recently published study by the Met Office and Newcastle University warned that climate change could result in heavier summer rainfall in Britain, which in turn could increase the risk of flash flooding.