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The heat builds even further on Thursday across England and Wales with temperatures in the mid to high twenties forecast, and 29C possible.

Mr Matthews said they always spent the build-up "peeking at the weather forecast", adding: "We've got it down a fine art now, basically we take everything we need out there."

Under the proposals, the university will shed around 300 roles through a voluntary programme - after initially forecasting around 700 jobs would go.

But when it comes to renewables, operators have very accurate short-term weather forecasts to predict when there will be a surplus of wind of solar power, so they adjust power supply accordingly, Prof Christensen said.

Under NOAA, which was established by President Richard Nixon in 1970, the lab advanced early forecasting, using sensors in the oceans and the sky.