An "explosion" of unstable air high in the atmosphere has created an "unusually elongated” jet stream which is poised to drag SCORCHING highs in from the Continent and Africa sending thermometers soaring to dangerous levels around the UK.
The entire country will swelter in the highest summer temperatures for more than 300 years, putting even The Great Heatwave of 1906 firmly in the shade.
The Great Heatwave lasted a week and was the most intense of the 20th Century, with temperatures exceeding 32C (90F) in the UK for FOUR days running.
The warning that Britain now faces an even WORSE blast comes just days after scientists revealed "highly unusual activity" on the surface of the sun which sent huge solar flares spiralling towards earth.
Forecasters made the shock prediction as forecasting models revealed a bizarrely long, 'buckled' jet stream - associated with very hot weather - is heading straight for the UK.
Piers Corbyn, forecaster for WeatherAction, said a colossal swathe of roasting air is poised to flood in from Spain and the Sahara Desert.
He said: “This is due to the jet stream which is going to stay unusually elongated keeping high pressure to the east.
“We are going to get a steady flow of air from Spain, Africa and the Sahara with the extreme heat also triggering some thunder storms.
“It is going to be mostly sunny and very pleasant and we could even beat the record high for August of 101.3F (38.5C) set in 2003.
“We are definitely looking at what could turn out to be the hottest August on record after a cooler start to the month.”