On the three previous hottest days, Heathrow was already at or above 33C by 11am (BST). It's going to be a long way short of that today, but the modelling does suggest a big rise through the afternoon.
Justin - I think he means the models that have 35-36C maxima are showing temps 2-3C lower for the current time than they are right now in reality?
Originally Posted by: Rob K