On 3 June, 22:05, Tudor Hughes wrote:
On Jun 2, 10:23*pm, wrote:

How come this time there are no thunderstorms? Usually when the air changes
from hot air to cold air there are?

http://www.metcheck.com/V40/UK/HOME/

* * * The change to cooler air was confined to the lower layers thus
increasing the stability rather than reducing it, quite unlike the
case where the breakdown of a hot spell comes from the west where the
upper air cools while the surface remains warm for a time. *This time,
rather unusually, it was the other way round. *There was no related
marked change in the upper air pattern though there will be over the
net few days.

Tudor Hughes, Warlingham, Surrey.

With all of the above in mind I wonder how rare a phenomenon this is -
ie cool air moving north to south in summer?