July 18 2014 Thunderstorms

On the morning of July 18 2014 a line of thunderstorms travelled up from the channel and formed a squal line from Portsmouth in a NNE direction. This squal line brought frequent lightning, lots of thunder, heavy rain and strong winds. However many of you may have been woken by a very active storm cell that travelled from the French coast across the channel to us where it brought frequent lightning and some very loud rumbles of thunder.

A video of this can be found below.

Another video of the storms

During the evening of July 17 2014 the atmosphere was becoming gravely unstable and with the high daytime temperatures and a low dew point the conditions for storms to form were very good. Looking at the latest GFS model runs they were showing a highly unstable atmosphere with CAPE values of 2000 j/kg for 00:00 on July 18 with lifted index values of -6

And also on the 18z GFS run for 03z on July 18 there are CAPE values of 300 j/kg with lifted index values of -4.


Over 35,000 lightning strikes were reported up to 09:00 on July 18, the storm cell that passed over us had recorded lots of strikes.


If you have any pictures or videos of the storms then please email them to [email protected] or post them on our Facebook or Twitter pages.