Cranwell is home to the RAF's training college
The hot weather has melted the flight line at a key RAF base in Lincolnshire, impacting flying training for pilots, Sky News understands.
An RAF spokesperson, however, insisted that flying training had not been affected.
An informed source told Sky News that officials at RAF Cranwell had been "dragging tar around" on their boots and even on the wheels of the Phenom and Prefect training aircraft since the start of the summer as the tarmac on the ground softened in the sunshine.
Comment: This spring throughout Europe has been unseasonably warm and dry, and apparently this melting occurred even prior to the current heatwave.
The situation at the flight line - the area where aircraft are serviced, parked and prepared for use - became so grave in the heat on Monday that flights were halted, according to the source.
Temperatures soared across the UK, hitting 32C in London, with the Met Office warning it will only become hotter.
Comment: Many of these recordings are taken from places that give biased readings, such as near built up environments , and even airport tarmac; however, this is still far from even the highest temps claimed, because in 2019 the all-time record was 38.7C.
The flight line is also where aviators board their aircraft and taxi towards the runway.
"Our aircraft flight line has melted in the heat, so all flying at Cranwell has been stopped," the source said.
"Obviously all the trainees are f***** off as it's just a s*** show."
Asked about the claim that flying training on aircraft at the base had been halted because of the flight line melting in the heat, the RAF spokesperson said: "As a precautionary measure, the main aircraft service area at RAF Cranwell is currently unavailable for routine use.
"Flying training is not affected and will continue by using alternative service areas."
It was not immediately clear which alternative areas, though possibly RAF Barkston Heath, about a 10-mile drive from Cranwell.
Adding to the pressure, several airfields have been closed in recent years as part of cost-cutting, limiting the availability of viable alternatives.
The informed source insisted: "All flying today [Monday] and tomorrow [from RAF Cranwell] is cancelled."
The source said around 60 students doing elementary flying training and multi-engine training courses have been impacted by the disruption.
It is understood that an investigation has been launched to find out why the main flight line has suffered problems. Extreme heat is thought to have been a contributory factor.
Comment: Rather than this speaking to some kind of extraordinary heatwave scorching the UK and catching everybody by surprise, because it isn't that extreme, it speaks to the incompetent and failing state of the UK's institutions. And one need not look very far for a number of other examples to see how bad the situation really is; and, notably, it's just as bad, if not worse, over in the US: