A red warning for extreme heat has been issued in much of England for the first time ever – meaning there is a “very likely” risk to life.
In another first, England’s heat-health alert has been upgraded to Level 4, a national emergency warning that even the fit and healthy could fall ill or die, not just the high-risk and vulnerable groups.
There is a 50% chance of the 40C barrier broken somewhere in the red warning zone, which has never happened before.
But what is the danger?
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