When?

It seems to me that the prediction of a UK heatwave and the prediction of Trump going to jail suffer from the same problem - both are allegedly just around the corner, but seem as far away as ever. 

That said, the summer heat wave seems, according to the Met Office, a lot nearer - mid August, by all accounts, but predictions made that far ahead are usually very inaccurate. However, it's only a quirk of pressure that's keeping it in southern Europe.