new post from PJB from UKWW
http://www.ukweatherworld.co.uk/forum/index.php?/topic/121888-convective-outlook-tuesday-23rd-july-2019/
Airmass and EIR Imagery indicates the Plume is now destabilising and cloud growth is now rapidly occuring within the plume of >20C Theta- W, the storms over the Channel moving north but developing to the NW suggesting they are ingesting this air as the main source, expect these to further develop NNW over Hants, Dorset and CS England. Further potent storms now also developing over SW England. The ribbon of Positive Vorticity is further advecting NNE and this improved environment is allowing the storms to develop in situ, Further building will occur within the plume