Engineers at a Derbyshire reservoir said they remain “concerned” a dam could burst and flood a nearby town with 1.3 million tonnes of water.
Sudden floods have caused evacuations and disruption across the UK after heavy downpours.
Cambridge has recorded a temperature of 38.7 degrees, which if validated would be the hottest UK temperature on record.
Train commuters face disruption after yesterday's extreme heat caused chaos on the rail network.
The heatwave has continued to smash records, with a record July temperature of 38.1 degrees being reached at Cambridge.
Health experts have urged people to take care of themselves and their loved ones as a heatwave takes hold across southern England.
As Ali rolled in on Wednesday morning the Met Office updated its amber weather warning of wind.
Eight places in the centre, south and east of Portugal have broken their local temperature records during the ongoing heatwave.
Temperatures are expected to peak at around 47C this weekend.
The heatwave is being disrupted with thunderstorms, which have prompted the Met Office to issue a weather warning.
A high of 28C would beat the 2001 April high of 27.8C (82F), says Met Office
Wednesday could see the hottest day of the year so far - as temperatures may reach as high as 25C (77F) in the South East
Hay fever and asthma closely linked, says Asthma UK, as charity offers advice for those affected
Forecasters predict double-digit temperatures across the UK heading towards the weekend
A cold front is heading to the UK from Poland which is expected to bring ice, snow and strong winds
Snow hit the UK as late as April in 1908, after already falling in January
Travel disruption due to the weather is expected to continue all week
If you're dreading the commute home in the Beast from the East, you could stay in a hotel instead
Many Twitter users have revealed the problems they've had caused by the weather
Many have criticised others for overreacting to the winter weather
Warnings that hospitals may not be able to cope with big freeze
Storm Georgina has arrived in the UK bringing gusts of up to 90 mph
'Ice boy' has appeared in many news reports and also started a debate on child poverty in the country
If you've not built a snowman yet, hopefully these photos will give you some inspiration
The Korean Central News Agency said Kim Jong-un climbed two miles up Mount Paektu
After extreme weather over the weekend, hundreds of planes and airports have been affected by the snow and ice.
Gary Rosario and Sandra Harasimowicz stayed at their home in Puerto Rico and put their cats on top of kitchen cupboards
Hurricane Maria has already killed at least 31 people
You've probably noticed that the weather has already been getting colder, and it's now officially autumn
Storm Aileen is approaching the UK but it seems many people are more concerned about the name rather than the weather
Emergencies have been declared and many people are being evacuated in preparation for the storm
Twitter users react to #Britishsummertime
A 50-year-old man died when a tree fell on his parked car, his wife was also injured
Many people in the UK simply can't take the heat
Storm Doris has been raging in the UK today, bringing gale-force winds and snow and many on Twitter have been sharing their experiences of the storm
As the weather is set to stay quite cold this weekend, some places in the UK are already seeing some snow
Forecasters have warned that temperatures over the next few days will be up to five degrees colder than usually expected at this time of year, which could bring snow and sleet
Fog has caused travel disruption across the south of England, as thousands are facing flight cancellations and delays