Monster thunderstorm potential for Fri Night/Sat Night

The lifted index measures atmospheric instability (derived from CAPE convective available potential energy in joules per kg) and goes like this:

6 or Greater, Very Stable Conditions
Between 1 and 6 : Stable Conditions, Thunderstorms Not Likely

Between 0 and -2 : Slightly Unstable, Thunderstorms Possible, With Lifting Mechanism (i.e., cold front, daytime heating, ...)

Between -2 and -6 : Unstable, Thunderstorms Likely, Some Severe With Lifting Mechanism

Less Than -6: Very Unstable, Severe Thunderstorms Likely With Lifting Mechanism

And we potentially have this:

User Posted Link

It's quite hard to see the outline of the UK, but those -8,-9, and -10's are over the Southeast and East Anglia. It's too far out to have any certainty and it will change a lot between now and then, but that is Tornado/Supercell territory.

Posted By: yarmyyarmy, Jul 16, 14:08:00