THE Met Office has issued a severe yellow weather warning cross the country – with thunderstorms set to batter Brits for 13 hours.
Temperatures are expected to reach a record breaking 39C tomorrow as the country basks in a sweltering heatwave.
However, the hot weather will also spark a flurry of storms across Britain.
The warning is in place from 3pm tomorrow until 4am on Friday morning.
Brits have been warned of difficult driving conditions, road closures, delays to trains and buses, power cuts and flooding.
Thunderclouds moved into southern and western parts of the UK last night as lightning struck.
Another severe yellow weather warning was in place until 9am this morning.
North Wales was the wettest area overnight, getting 15mm of rain in one hour.
However, the skies had largely cleared across the UK by the morning – with the mercury rising even higher.
Tomorrow’s extreme temperatures may affect trains services and millions of commuters.
When in direct sunshine, the metal rails can get as hot as 50 degrees, Southeastern rail said.
“This is the single worst day for drowning incidents the Brigade has attended”
Deputy Assistant Commissioner for Fire Safety, Paul Trew
Railway lines can snap in hot temperatures as they expand and start to curve.
Network Rail has imposed speed restrictions to “reduce the chance of rails buckling in the heat”.
Southeastern also confirmed it would be running a “significantly reduced service” on Thursday.
Meanwhile, firefighters have issued a warning about cold water shock after three people drowned in London yesterday.
Cops today recovered the body of a 22-year-old man who went for a dip with friends in the Shadwell Basin in Wapping, east London, yesterday evening.
Police are still searching for two others who vanished after diving into the Thames.
Deputy Assistant Commissioner for Fire Safety, Paul Trew, said: “This is the single worst day for drowning incidents the Brigade has attended in my 25 year career.
“Going into the water might seem like a good idea in the hot weather but it is incredibly dangerous as the water is a lot colder than you’d expect.
“Cold water can cause your body to go into shock no matter how fit you are, causing panic, anxiety, disorientation and loss of muscular control.
“These reactions can also cause you to gasp for air resulting in water being inhaled.”