Matt Hugo now saying that OK yes there is a chance of extreme heat at the weekend but it's a symptom of the transition to an unsettled end to July. The GFS and ECM charts this morning don't seem to support that idea, as they look to be fairly HP dominated after the weekend.
On the subject of heatwave signs, there was a lovely display of altocumulus clouds before sunset yesterday evening which I always associate with hot spells.
Originally Posted by: Rob K